Area of 2D Shapes

Front

What is the formula for the area of a circle?

Back

Area = πr² (where r is the radius and π is approximately 3.14)

Front

How do you calculate the area of a rectangle?

Back

Area = length x width

Front

What is the formula for the area of a triangle?

Back

Area = 1/2 x base x height

Front

What is the formula for the area of a trapezoid?

Back

Area = 1/2 h(b₁ + b₂) (where h is the height and b₁ and b₂ are the lengths of the two bases)

Front

What is the area of a square with a side length of 4 cm?

Back

Area = 4 cm x 4 cm = 16 cm²

Front

What is the area of a circle with a radius of 5 cm? (Use 3.14 for pi)

Back

Area = 3.14 x (5 cm)² = 78.5 cm²

Front

What is the area of a rectangle with a length of 10 cm and a width of 3 cm?

Back

Area = 10 cm x 3 cm = 30 cm²

Front

What is the area of a triangle with a base of 6 cm and a height of 4 cm?

Back

Area = 1/2 x 6 cm x 4 cm = 12 cm²

Front

What is the area of a trapezoid with bases of 8 cm and 6 cm, and a height of 5 cm?

Back

Area = 1/2 x 5 cm x (8 cm + 6 cm) = 35 cm²

Front

What is the area of a square with a side length of 7 in?

Back

Area = 7 in x 7 in = 49 in²