Perimeter of Composite Shapes

Front

What is the formula for the circumference of a circle?

Back

Circumference = π × diameter (C = πd) or Circumference = 2 × π × radius (C = 2πr)

Front

What does the term 'diameter' refer to in a circle?

Back

The diameter is the distance across the circle, passing through the center, and is twice the length of the radius.

Front

What is the relationship between the radius and diameter of a circle?

Back

The diameter is twice the length of the radius (d = 2r).

Front

If a circle has a radius of 5 cm, what is its circumference?

Back

Circumference = 2 × π × 5 cm = 31.4 cm (using π ≈ 3.14).

Front

What is the circumference of a circle with a diameter of 10 meters?

Back

Circumference = π × 10 m ≈ 31.4 m (using π ≈ 3.14).

Front

How do you find the perimeter of a composite shape?

Back

To find the perimeter of a composite shape, add the lengths of all the outer sides.

Front

What is the perimeter of a rectangle with a length of 8 m and a width of 3 m?

Back

Perimeter = 2 × (length + width) = 2 × (8 m + 3 m) = 22 m.

Front

What is the term for the distance around a shape?

Back

The term is 'perimeter'.

Front

If a circle has a circumference of 62.8 cm, what is its diameter?

Back

Diameter = Circumference / π = 62.8 cm / 3.14 = 20 cm.

Front

What is the circumference of a circle with a diameter of 4 feet?

Back

Circumference = π × 4 ft ≈ 12.56 ft (using π ≈ 3.14).