CIRCUMFERENCE & AREA OF A CIRCLE

Front

What is the definition of the diameter of a circle?

Back

The diameter of a circle is the distance from an edge of a circle to another edge through the center.

Front

What is the definition of the radius of a circle?

Back

The radius of a circle is the distance from the center of the circle to an edge of the circle.

Front

What is the formula for the circumference of a circle?

Back

The circumference (C) of a circle is calculated using the formula C = πd or C = 2πr, where d is the diameter and r is the radius.

Front

What is the formula for the area of a circle?

Back

The area (A) of a circle is calculated using the formula A = πr², where r is the radius.

Front

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

Back

154 m² (A = π(7)² = 154 m²).

Front

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

Back

31.42 m (C = πd = π(10) = 31.42 m).

Front

What is the relationship between diameter and radius?

Back

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

Front

What is the approximate value of π (pi)?

Back

π (pi) is approximately 3.14.

Front

How do you convert diameter to radius?

Back

To convert diameter to radius, divide the diameter by 2 (r = d/2).

Front

How do you convert radius to diameter?

Back

To convert radius to diameter, multiply the radius by 2 (d = 2r).