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Math Support 3/23/09

Math Support 6th Grade Cavallo Chapter 5 Geometry and Measurement

QuestionAnswer
perimeter the distance around a figure
area the space a figure encloses
line extends forever in two directions
ray a part of a line; extends forever in one direction and has one endpoint
line segment a part of a line
angle two rays with a common endpoint
vertex the common endpoint of an angle
acute angle an angle that measures less than 90 degrees
right angle an angle that measures exactly 90 degrees
obtuse angle an angle that measures more than 90 degrees and less than 180 degrees
straight angle an angle that has a measure of exactly 180 degrees; it is a line
protractor a tool used to measure angles
complementary angles two angles that add up to 90 degrees
supplementary angles two angles that add up to 180 degrees
congruent when two figures have the same shape and the same size
bisect divides a figure into two equal parts
plane an infinite, flat surface
parallel lines that never meet
transversal a line that intersects two or more parallel lines
midpoint the point that divides a line segment into two equal segments
perpendicular lines, rays, and line segments that form right angles
quadrilateral four-sided figure
parallelogram quadrilateral with two pairs of parallel sides and two pairs of congruent sides
rectangle quadrilateral; parallelogram; has four right angles
square quadrilateral; parallelogram; rectangle; rhombus; has four right angles and four congruent sides
rhombus quadrilateral; parallelogam; has four congruent sides
trapezoid quadrilateral; has only one pair of parallel sides
polygon a geometric figure with at least three sides
triangle a polygon with three sides
pentagon a polygon with five sides
hexagon a polygon with six sides
octagon a polygon with eight sides
regular polygon a polygon where all of the sides and all of the angles are equal
(n - 2)180 formula to find the sum of the measures of the angles; n is the number of sides of the polygon
perfect square the square of a whole number
square root the length of the side of a square with an area equal to the number
hypotenuse in a right triangle, the side opposite the right angle; it is the longest side
legs the two sides of the right triangle (NOT the hypotenuse)
pythagorean theorem formula used to find a missing length of a right triangle; the sum of the squares of athe legs of a right triangle is equal to the square of the hypotenuse
area of a triangle one half the product of the lengths of the base and the height
area of a parallelogram the product of its height and the length of its base
Created by: mnash
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