Question

A semicircular garden bed at the botanical gardens needs to be fenced off while the seedlings are established. If the straight edge of the bed is 20.5m in length, calculate the total length of fencing needed to surround the garden bed.

Answer 1

So you need the length of the straigh edge, which you know is 20.5 m, plus the semicircle's perimeter.
The radius is 10.25
So fence = 20.5 + π(diameter)
= 20.5 + 20.5π
= ...

Answer 2

thanks

Answer 3

D = 20.5 m. = diameter.
L = D + pi*D/2 = 20+(3.14*20.5/2) = 52.2 m.