Real World Area and Circumference Flashcard

Front

What is the formula to calculate the circumference of a circle?

Back

Circumference = π × diameter or Circumference = 2 × π × radius.

Front

If a circle has a diameter of 10 cm, what is its circumference?

Back

Circumference = π × 10 cm ≈ 31.42 cm.

Front

What is the relationship between diameter and radius?

Back

The radius is half of the diameter. Radius = diameter / 2.

Front

How do you calculate the area of a circle?

Back

Area = π × radius².

Front

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

Back

Area = π × (5 m)² ≈ 78.54 m².

Front

What is the formula for the perimeter of a rectangle?

Back

Perimeter = 2 × (length + breadth).

Front

If a rectangle has a length of 8 m and a breadth of 3 m, what is its perimeter?

Back

Perimeter = 2 × (8 m + 3 m) = 22 m.

Front

What is a semicircle?

Back

A semicircle is half of a circle, formed by cutting a whole circle along its diameter.

Front

How do you calculate the perimeter of a semicircle?

Back

Perimeter = diameter + (π × radius).

Front

If the diameter of a semicircle is 10 m, what is its perimeter?

Back

Perimeter = 10 m + (π × 5 m) ≈ 27.71 m.