Question

Find the perimeter of the circle. use 3.14 for pi.

Answer 1

The perimeter of an entire circle is the circunference, which is given by

`C=\pi d`

where d is the diameter.

In our case d=23cm then, by sbustituting this values into the last formula,we get

`C=(3.1416)\cdot(23)`

which gives C= 72.26 cm.

However, we need the perimeter of half circle, which is half C plus the vertical segment (23cm), that is

`P=(C)/(2)+23`

then, the perimeter P is

`\begin{gathered} P=(72.26)/(2)+23 \\ P=59.13\text{ cm} \end{gathered}`

then, the answer is 59.13 cm