Area of Polygons Flashcards

Grade 6 · Math · Flashcards

Area formulas, key vocabulary, and practice calculations for common polygons.

Flashcards

Area of a rectangle: A = l × w (length times width)
Area of a square: A = s² (side squared)
Area of a triangle: A = ½ × b × h
Area of a parallelogram: A = b × h (base times perpendicular height)
Area of a trapezoid: A = ½ × (b₁ + b₂) × h
Rectangle: l = 12, w = 5: A = 60 square units
Triangle: b = 10, h = 8: A = ½ × 10 × 8 = 40 square units
Parallelogram: b = 6, h = 9: A = 6 × 9 = 54 square units
Trapezoid: b₁ = 5, b₂ = 9, h = 4: A = ½ × (5 + 9) × 4 = 28 square units
What is perpendicular height?: The straight-line distance from base to opposite side at a 90° angle
Composite figure strategy: Break into simple shapes, find each area separately, then add them together
Area units: Always written as square units: cm², m², in², ft²