Geometry Flashcard: Perimeters and Areas

Front

What is the formula for the perimeter of a rectangle?

Back

The perimeter (P) of a rectangle is given by the formula: P = 2(length + width).

Front

Calculate the perimeter of a rectangle with length 10 cm and width 4 cm.

Back

P = 2(10 cm + 4 cm) = 28 cm.

Front

What is the formula for the perimeter of a triangle?

Back

The perimeter (P) of a triangle is the sum of the lengths of its sides: P = side1 + side2 + side3.

Front

Calculate the perimeter of a triangle with sides of 5 cm, 7 cm, and 9 cm.

Back

P = 5 cm + 7 cm + 9 cm = 21 cm.

Front

What is the formula for the area of a rectangle?

Back

The area (A) of a rectangle is given by the formula: A = length × width.

Front

Calculate the area of a rectangle with length 6 cm and width 3 cm.

Back

A = 6 cm × 3 cm = 18 cm².

Front

What is the formula for the area of a triangle?

Back

The area (A) of a triangle is given by the formula: A = (1/2) × base × height.

Front

Calculate the area of a triangle with a base of 10 cm and a height of 5 cm.

Back

A = (1/2) × 10 cm × 5 cm = 25 cm².

Front

What is the formula for the area of a trapezoid?

Back

The area (A) of a trapezoid is given by the formula: A = (1/2) × (base1 + base2) × height.

Front

Calculate the area of a trapezoid with bases of 8 cm and 4 cm, and a height of 3 cm.

Back

A = (1/2) × (8 cm + 4 cm) × 3 cm = 18 cm².