Area of Circles, Parallelograms, Triangles & Trapezoids Flashcard

Front

What is the formula for the area of a circle?

Back

Area = πr², where r is the radius of the circle.

Front

What is the formula for the area of a parallelogram?

Back

Area = base × height.

Front

What is the formula for the area of a triangle?

Back

Area = 1/2 × base × height.

Front

What is the formula for the area of a trapezoid?

Back

Area = 1/2 × (base1 + base2) × height.

Front

What does 'area' mean in geometry?

Back

The amount of space inside a shape.

Front

If a circle has a radius of 3 cm, what is its area?

Back

Area = π(3)² = 28.27 cm² (approximately).

Front

A parallelogram has a base of 10 cm and a height of 5 cm. What is its area?

Back

Area = 10 cm × 5 cm = 50 cm².

Front

A triangle has a base of 8 cm and a height of 4 cm. What is its area?

Back

Area = 1/2 × 8 cm × 4 cm = 16 cm².

Front

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

Back

Area = 1/2 × (6 cm + 10 cm) × 4 cm = 32 cm².

Front

What is the area of a rectangle with a length of 8 ft and a width of 3 ft?

Back

Area = 8 ft × 3 ft = 24 ft².