Question

A circle has a radius of 6.1cm

Work out the circumference of the circle. Give your answer to three significant figures

Answer 1

The circumference of a circle with a radius of 6.1 cm, calculated to three significant figures, is 38.3 cm.

Step-by-step explanation:

To calculate the circumference of a circle, you use the formula C = 2πr, where C represents the circumference and r is the radius of the circle. Given that the radius is 6.1 cm, we have:

C = 2π(6.1 cm) = 12.2π cm.

Using the value of π (pi) as 3.1415927..., we compute the circumference:

C = 12.2 cm × 3.1415927... = 38.31925962 cm.

However, since the radius was given to three significant figures, the final answer should also be to three significant figures:

C = 38.3 cm.

Answer 2

To calculate the circumference of a circle with a radius of 1 meter, simply follow these steps: 1 Multiply the radius by 2 to get the diameter of 2 meters. 2 Multiply the result by π, or 3.14 for an estimation. 3 And there you go; the circumference of a circle with a radius of 1 meter is 6.28 meters.

Step-by-step explanation: