2D Shapes

Areas of Shapes

Circles

Circle

Circumference of Circle:
Formula: [ 2 * π * r ] or [ π* d ]
Radius: units
Result: units

Area of Circle:
Formula: [ π * r² ] or [ π * (d/2)² ]
Radius: units
Result: units²

Triangles

Triangle

Area of Triangle:
Formula: [ 1/2 * b * h ]
Length of base: units
Height: units
Result: units²

Quadrilaterals

Square / Rectangle

Area of Square / Rectangle:
Formula: [ b * h ]
Length of base: units
Height: units
Result: units²

Parallelogram

Area of Parallelogram:
Formula: [ b * h ]
Length of base: units
Height: units
Result: units²

Rhombus / Diamond / Kite

Area of Rhombus / Diamond / Kite:
Formula: [ 1/2 * b * h ]
Length of base: units
Height: units
Result: units²

Trapezoid

Area of Trapezdoid:
Formula: [ 1/2 * (b1 + b2) * h ]
Length of base 1: units
Length of base 2: units
Height: units
Result: units²