Pre-AlgebraGeometry Terms: Plane Figures
5-1 and5-2 Terms: Points, Lines, and Planes
1. A _______________ is an exactlocation in space. It is usually represented as a dot, but it has no size at all.
2. A _______________ is a straightpath that extends without end in opposite directions.
3. A _______________ is a part of aline. It has one endpoint and extends without end in one direction.
4. A ________________ is a part of aline or a ray that extends from one endpoint to another.
5. A ________________ is a perfectlyflat surface that extends infinitely in all directions.
6. ________________________ are pointsthat lie on the same line.
7. Figures are ___________________ ifthey have the same shape and same size.
8. A ________________ is a line thatintersects any two or more other lines.
5-1 and5-2 Terms: Angles
1. An _____________is formed by tworays with a common endpoint.
2. Two rays are the sides of an angle.This common endpoint is called the ______________.
3. A _________________ angle is anangle that measures exactly 90 degrees.
4. An _______________ angle is anangle that measures less than 90 degrees.
5. An ________________ angle is anangle that measures more than 90 degrees but less than 180 degrees.
6. A _________________ angle is anangle that measures exactly 180 degrees.
7. If the sum of the measures of twoangles is 90 degrees, then the angles are __________________ angles.
8. If the sum of the measures of twoangles is 180 degrees, then the angles are _______________ angles.
9. Intersecting lines form two pairsof __________________ angles. Theopposite angles are always congruent.
5-2Terms: Parallel and Perpendicular Lines
1. When lines, segments, or raysintersect, they form angles. If the angles formed by two intersecting lines areequal to 90 degrees, the lines are _____________________ lines.
2. Some lines in the same plane do notintersect at all. These lines are _______________ lines.
3. _____________ lines do notintersect, and yet they are also not parallel.
4. ________________ angles are theopposite angles formed by two intersecting lines. These angles have the samemeasure, so they are congruent.
5. A _______________ is a line thatintersects any two or more lines. __________ angles are formed when atransversal intersects two lines. When those two lines are ____________, all ofthe acute angles formed are congruent, and all of the obtuse angles formed arecongruent. These obtuse and acute angles are ______________________.
5-3 Terms: Triangles
1. A ________________ triangle has nocongruent sides and no congruent angles.
2. An _________________ triangle has at least 2 congruent sides and 2congruent angles.
3. In an ________________________triangle all of the sides and all of the angles are congruent.
4. In an _______________ triangle, allof the angles are acute.
5. An _________________ triangle has one obtuse angle.
6. A _______________ triangle has oneright angle.
7. The Triangle Sum Theorem: the sum of the angles in a triangle is _____degrees.
1. A ______________ is a closed planefigure formed by three or more line segments.
2. Each line segment forms a_____________ of the polygon, and meets, but does not cross.
3. A polygon with 3 sides and 3 anglesis called a ________________.
4. A polygon with 4 sides and 4 anglesis called a ____________________.
5. A polygon with 5 sides and 5 anglesis called a ____________________.
6. A polygon with 6 sides and 6 anglesis called a ____________________.
7. A polygon with 7 sides and 7 anglesis called a ______________________.
8. A polygon with 8 sides and 8 anglesis called an ____________________.
9. A polygon with 9 sides and 9 anglesis called a ____________________.
10. A polygon with 10 sides and 10angles is called a ____________________.
11. A __________________ polygon is apolygon in which all sides are congruent and all angles are congruent.
12. Explain why a circle is not apolygon.
1. A ___________________ has two pairsof parallel sides.
2. A ___________________ has fourcongruent sides.
3. A ____________________ has fourright angles.
4. A ____________________ has fourcongruent sides and four right angles.
5. A _____________________ has exactlyone pair of parallel sides.
6. A _____________________ has exactlytwo pairs of congruent, adjacent sides.
7. The sum of the angles of a quadrilateralis ______ degrees.
1. A _________________ changes theposition or orientation of a figure.
2. A _________________ is when afigure slides along a straight line without turning.
3. A _________________ is when afigure turns around a fixed point.
4. A _________________ is when thefigure flips across a line of reflection, creating a mirror image.
5. A _________________ enlarges orreduces a figure.
7.RP Ratios and Proportional Relationships
· ratio- a comparison of two quantities by division ( 12 to 25, 12/25, 12:25)
· equivalent ratios- ratios that name the same comparison
· proportion- an equation that states that two ratios are equivalent
· rate- a ratio that compares two quantities measured in different units ( 55mi/h )
· unit rate- a rate in which the second quantity in the comparison is one unit (55 mi/h the hour is per 1 hour)
· unit price- a unit rate used to compare prices
· unit conversion factor- a fraction used in unit conversion in which the numerator and denominator represent the same amount but are in different units ( 60 min/1 h, 100 cm/ 1 m)
· cross product- the product of numbers on the diagonal when comparing two ratios (heart method)
Seventh Grade Accelerated Math(Pre-Algebra) Vocabulary #1
Expressions and Equations(7.EE.1, 7.EE.4, 7.EE.4a)
· expression- a variable or combinationof variables, numbers, and symbols that represents a mathematical relationship 5+ 3 3y - 2 (18 + n)/4
· algebraicexpression-an expression that contains at least one variable 3y - 2
· verbalexpression-a word or phrase "theproduct of 7 and m"
· equation- a statement that shows twomathematical expressions are equal
9x +3 = 4x - 7
· variable- a quantity that changes orcan have different values; a symbol, a letter or picture, that stands for avariable quantity 2n +3 n is the variable
· substitute- to replace a variable witha number or another expression in an algebraic expression
· coefficient- a numerical factor in aterm of an algebraic expression
5x 5 is the coefficient 4.7y² 4.7 is the coefficient
· constant- a value that does notchange 1,954 + a 1,954 is the constant
· solve- to find the value thatmakes the equation true
· inverse- "opposite"operations; operations that "undo" each other
addition and subtraction areinverse operations...so are multiplication and division
· isolatethe variable-to get the variable alone on one side of an equation or inequality in order tosolve the equation or inequality
· propertiesof equality-
ü addition property of equality- you can add the same amountto both sides of an equation and the statement will still be true
ü subtraction property ofequality-you can subtract the same amount to both sides of an equation and the statementwill still be true
ü multiplication property ofequality-you can multiply the same amount to both sides of an equation and the statementwill still be true
Name__________________________ Date_____________ Block__________
SeventhGrade Accelerated Math (Pre-Algebra) Vocabulary #2
Expressionsand Equations (7.EE.1, 7.4EE.4, 7.EE.4a, 7.EE.4b)
· multi- step problem-problems that require more than one computation or operation, or theapplication of more than one mathematical principle or property
· inequality-a mathematical sentence that compares two unequal expressions using one of thesymbols < , > , ≤ , ≥ , or ≠
· algebraic inequality-an inequality that contains at least one variable
d + 3 > 10 5a > b + 3
· solution set-the set of values that make a statement true
· term-the parts of an expression that are added or subtracted
7x + 5 - 3y² + 2x 7x, 5, 3y² and 2x are terms
· like terms-two or more terms that have the same variable raised to the same power
7x + 5 - 3y² + 2x 7x and 2x are like terms
· simplify-combine all possible operations, including like terms
It is important for your child to reveiw all of the math vocabulary discussed and explored throughout the course of the year. They need to be familiar with the words and meanings in order to solve mathematical problems. They may use their math notebook to brush up on their vocabulary.