Area of Circles

Front

What is the formula for the area of a circle?

Back

Area = π × r², where r is the radius.

Front

What does 'π' (pi) represent in the context of circles?

Back

π (pi) is a constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.

Front

If the radius of a circle is 7, what is its area?

Back

154.0 (Area = π × 7² = 154.0)

Front

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

Back

The diameter is twice the radius (Diameter = 2 × r).

Front

How do you find the radius if you know the area of a circle?

Back

Radius = √(Area/π).

Front

What is the area of a circle with a radius of 10?

Back

314.16 (Area = π × 10² = 314.16)

Front

What is the area of a circle with a radius of 5?

Back

78.54 (Area = π × 5² = 78.54)

Front

If the area of a circle is 78.54, what is the radius?

Back

5 (Radius = √(78.54/π) = 5)

Front

What is the area of a circle with a radius of 12?

Back

452.39 (Area = π × 12² = 452.39)

Front

What is the area of a circle with a radius of 6?

Back

113.1 (Area = π × 6² = 113.1)