Area and perimeter of circles, triangles, squares

Front

What is the formula for the area of a circle?

Back

Area = π × r², where r is the radius.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 × π × r or Circumference = π × d, where d is the diameter.

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 square?

Back

Area = side × side or Area = side².

Front

What is the formula for the perimeter of a square?

Back

Perimeter = 4 × side.

Front

What is the formula for the perimeter of a triangle?

Back

Perimeter = side1 + side2 + side3.

Front

If the radius of a circle is 5 ft, what is its area?

Back

Area = π × (5)² = 78.5 ft².

Front

If the diameter of a circle is 10 m, what is its circumference?

Back

Circumference = π × 10 = 31.4 m.

Front

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

Back

Area = 1/2 × 10 × 5 = 25 sq yd.

Front

What is the perimeter of a square with a side length of 4 in?

Back

Perimeter = 4 × 4 = 16 in.