Area & Perimeter

Front

What is the formula for the circumference of a circle?

Back

The circumference (C) of a circle is given by the formula C = 2πr, where r is the radius.

Front

How do you find the radius of a circle from its circumference?

Back

To find the radius (r) from the circumference (C), use the formula r = C / (2π).

Front

What is the formula for the area of a circle?

Back

The area (A) of a circle is given by the formula A = πr^2, where r is the radius.

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

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

What is the formula for the area of a triangle?

Back

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

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

What is a composite shape?

Back

A composite shape is a shape that is made up of two or more simple shapes, such as rectangles, triangles, and circles.

Front

How do you calculate the area of a composite shape?

Back

To calculate the area of a composite shape, find the area of each simple shape and then sum them up.

Front

What is the formula for the area of a parallelogram?

Back

The area (A) of a parallelogram is given by the formula A = base × height.