MATH COMPREHENSION Tools A B iscoceles triangle at least two sides congruent scalene triangle no congruent sides equilateral triangle all congruent sides pythagoreom thereom a squared + b squared = c squared area legnth times width perimeter 2L + 2w circumference pie times the diameter acute less than 90 degrees obtuse greater than 90 degrees right equal to 90 degrees polygon 5 sides and 5 angles;closed plane figure made up of line segments area of trapezoid base times height divided by 2 area of a circle pie times radius squared radius half of diameter ;radius squared rhombus quadrilateral with 4 congruent sides rectangle opposite sides parallel square 4 right angles complementary 90 degrees supplementary 180 degrees area of a square 4 squared