Question

The radius of a circle is 5 yd.

Answer the parts below. Make sure that you use the correct units in your answers.
If necessary, refer to the list of geometry formulas.

Answer 1

Circumference =10 pi yard

Area =25 pi yard squared

Explanation:

C=2*pi*r

Circumfrance =10 pi

A=pi r^2

Area =25 pi

For the estimate just sub in pi on the calculator for pi, then round to the hundreth.

Circumfrence= just the unit

Area= squared

Answer 2

The exact circumference is 10π yd

The exact area of the circle is 25π yd²

The approximate circumference is 31.4 yd

The approximate area is 785 yd²

What is the exact area and circumference of the circle?

Radius, r = 5 yd

Circumference of a circle = 2πr

= 2 × π × 5 yd

= 10π yd

Area of a circle = πr²

= π × 5²

= π × 25

= 25π yd²

Approximate circumference = 2πr

= 2 × 3.14 × 5

= 31.4 yd

Approximate area = πr²

= 3.14 × 5²

= 3.14 × 25

= 785 yd²