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Quadrilaterals

★★☆☆☆Middle School

📖Definition

A polygon with four sides. The sum of interior angles is 360°.

Square area: A = s²

Square with side s

Rectangle area: A = l × w

Rectangle with length l, width w

Parallelogram area: A = b × h

Parallelogram with base b, height h

Trapezoid area: A = ((a + b))/(2) × h

Trapezoid with parallel sides a, b and height h

Rhombus area: A = (d₁ × d₂)/(2)

Rhombus with diagonals d₁, d₂

예제 1★☆☆☆☆

Find the area and perimeter of a rectangle 8cm by 5cm.

예제 2★★☆☆☆

Find the area of a trapezoid with parallel sides 4cm and 8cm, height 5cm.

Room area calculation

Land surveying

#geometry#quadrilateral#area