WGU Math for Educators D128

Sum of a polygon - Answer- (n-2)180 Right angle - Answer- 90 degrees acute angle - Answer- less than 90 degrees obtuse angle - Answer- greater than 90 degrees and less than 180 degrees reflex angle - Answer- greater than 180 degrees complementary angles - Answer- Two angles whose sum is 90 degrees supplementary angles - Answer- Two angles whose sum is 180 degrees interior angles of a polygon - Answer- angles inside of a polygon triangle - Answer- A polygon with three sides whose interior angles equal 180. isosceles triangle - Answer- A triangle that has 2 equal sides. equilateral triangle - Answer- a triangle with 3 equal sides (60 degrees) Triangle Inequality Theorem - Answer- The sum of the lengths of any two sides of a triangle must be greater than the length of the third side scalene triangle - Answer- no equal sides quadrilateral - Answer- a four-sided polygon with interior angles adding to 360 degrees Parallelogram - Answer- A quadrilateral with two pairs of parallel sides square - Answer- A quadrilateral with 4 sides that are equal and has all 90 degree angles rectangle - Answer- a parallelogram with 4 right angles Rhombus - Answer- A parallelogram with four congruent sides. Trapezoid - Answer- A quadrilateral with exactly one pair of parallel sides isosceles trapezoid - Answer- a trapezoid whose nonparallel opposite sides are congruent kite - Answer- a