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RISD 6 math vocab 2
RISD 6th math vocabulary for 2nd 9 wks.
| Math Vocabulary | Definition |
|---|---|
| simplify | to write a fraction or an expression in simplest form |
| factor tree | a diagram showing the prime factorization of a number |
| percent (%) | the ratio of a number to 100 |
| proportion | a mathematical sentence stating that two ratios are equal |
| rate | a ratio in which two quantities with different units of measure are compared |
| ratio | a comparison of two quantities |
| unit rate | the price for one unit of measure |
| circle graph | a round graph that uses pie-shaped sections to show percents or parts of the whole |
| congruent | having the same size and shape |
| line symmetry | a figure has line summetry if a line can divide the figure into two congruent parts |
| polygon | a closed figure made of line segments |
| regular polygon | a polygon in which all sides are the same length and all angles have the same measure |
| quadrilateral | a 4 sides polygon |
| parallelogram | a quadrilateral with opposite sides parallel and congruent |
| rhombus | a parallelogram whose four sides are congruent and whose opposite side angles are congruent |
| line | a straight path that extends infinitely in opposite directions |
| ray | a part of a line that has one endpoint and exends infinitely in the other direction |
| line segment | a part of a line with two endpoints |
| midpoint | the point on a line segment that divides it into two congruent parts |
| parallel lines | two lines in the same plane that never intersect |
| intersecting lines | two lines that cross at exactly the same point |
| perpendicular lines | lines that intersect at one point and form right angles |
| obtuse angle | an angle with a measure of more than 90 degrees but less than 180 degrees |
| right angle | an angle with a measure of 90 degrees |
| straight angle | an angle whose measure is 180 degrees |
| acute angle | an angle that measures greater than 0 degrees and less than 90 degrees |
| acute triangle | a triangle with 3 acute angles |
| equilateral triangle | a triangle with 3 equal sides |
| isosceles triangle | a triangle with 2 congruent sides |
| obtuse triangle | a triangle with one obtuse angle |
| right triangle | a triangle with one right angle |
| scalene triangle | a triangle with no congruent sides |
| circumference | the distance around a circle |
| diameter | a line segment that passes through the center of a circle and has its endpoint on the circle |
| radius | a line segment from the center of the circle to any point on the circle |
| Pi | the ratio of the circumference of a circle to its diameter |
Created by:
sgrubb
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