Basic Geometry Formulas

Front

What is the formula for the area of a circle?

Back

Area = π × r², where r is the radius.

Front

What is the area of a circle with a radius of 4?

Back

16π or about 50.24.

Front

What is the area of a triangle with a base of 10 cm and a height of 5 cm?

Back

Area = 1/2 × base × height = 25 cm².

Front

What is the formula for the area of a triangle?

Back

Area = 1/2 × base × height.

Front

What is the area of a circle with a diameter of 10 cm?

Back

25π or about 78.5 cm².

Front

What is the distance around a polygon called?

Back

Perimeter.

Front

What is the formula for the perimeter of a rectangle?

Back

Perimeter = 2 × (length + width).

Front

What is the radius of a circle with a diameter of 18?

Back

9.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 × π × r.

Front

What is the area of a rectangle with a length of 8 cm and a width of 4 cm?

Back

Area = length × width = 32 cm².