Question

Work out the area of a circle with diameteer 1.8cm

Answer 1

RHE FORMULA TO CALCULATE THE ARE OF A CIRCLE IS

`a = \pi {r}^(2)`

NOTE WE ARE ONLY GIVEN THE DIAMETER BUT IT CAN HELP US FIND THE RADIUS FOR WE KNOW THAT TWICE THE RADIUS IS THE THE DIAMETER

`2r = d \\2 r = 1.8 \\ (2r)/(2) = (1.8)/(2) \\ r = 0.9cm`

MEANING THE AREA WILL BE

`a = \pi {(0.9)}^(2) \\ a = 2.54 {cm}^(2)`

NOTE UNITS OF MEASUREMENTS ARE IMPORTANT