Formulas for Area of Shapes

Front

Formula for the Area of a Rectangle

Back

Area = Length × Width

Front

Formula for the Area of a Parallelogram

Back

Area = Base × Height

Front

Formula for the Area of a Triangle

Back

Area = ½ × Base × Height

Front

Formula for the Area of a Trapezoid

Back

Area = ½ × (Base₁ + Base₂) × Height

Front

What happens to the area of a parallelogram if you double the height?

Back

The area doubles! (Because height is multiplied directly in the formula.)

Front

A triangle has a base of 8 cm and a height of 5 cm. What is its area?

Back

Area = ½ × 8 × 5 = 20 cm²

Front

A trapezoid has bases of 10 cm and 6 cm, with a height of 4 cm. What is its area?

Back

Area = ½ × (10 + 6) × 4 = 32 cm²

Front

True or False: A parallelogram and a rectangle with the same base and height have the same area.

Back

True! (Both use Base × Height for area.)

Front

Common Mistake: What’s wrong with this triangle area calculation? A = 10 × 4 = 40

Back

They forgot to divide by 2! (Correct formula: ½ × 10 × 4 = 20.)

Front

Fill in the blank: To find the area of a triangle, multiply the base by the height, then _______.

Back

Divide by 2!