Question

A circular bicycle reflector has a diameter of 5 cm.

What is the approximate area of the reflector? Use 3.14 to approximate pi and round your answer to the nearest hundredth.

cm2

Answer 1

To find area of a circle you do....\[A = \pi r^2\]

Answer 2

how do we find the radius?

Answer 3

we times the area by 3.14 i think

Answer 4

Not quite...we need to divide the diameter by 2 so....5 divided by 2 is what?

Answer 5

2.5

Answer 6

Correct! So we know the radius...and what we will use for pi which is 3.14 so lets input it into the formula....\[A = 3.14 (2.5^2)\]

Answer 7

it can be 6.25 or 19.625 one of them

Answer 8

\[19.625 cm^2\] is Correct!

Answer 9

so my answer is 19.625

Answer 10

Yup! :)

Answer 11

thanks

Answer 12

np xD...was happy to help