Rectangle
Right Angle
Isosceles Triangle 2 equal sides
Two lines that never touch Parallel Two lines that never touch
Pyramid
Circumference
Parallelogram
Acute Angle
Scalene Triangle No equal sides
Two lines that form a 90° angle Perpendicular Two lines that form a 90° angle
Diameter
Trapezoid
Obtuse Angle
Equilateral Triangle 3 equal sides
Add all of the Sides Perimeter
Area Length x Width
8 cm 8 cm Isosceles triangle
Radius
Perpendicular Lines
Perimeter Add all sides
How many edges? 9
Right Angle Exactly 90°
135° Obtuse triangle
Length x Width Area
Parallel Lines
Obtuse Angle More than 90°
Same size and shape Congruent
How many faces? 6
Acute Angle Less than 90°
Prism