Triangle

Area (A) = 0.5 ✗ b ✗ h

Rectangle

Area (A) = w ✗ l

Parallelogram

Area (A) = b ✗ h

Rhombus

Area (A) = 0.5 ✗ d₁ ✗ d₂

Pentagon

Area (A) = 0.5 ✗ p ✗ b

Ellipse

Area (A) = π a b