How would this be done? ? !
worked explanation : )

Ok so what is do is
the bottom half is the radius

the top half is a little bit m ore tricky
we can do
18=base
15=sides
makes an equilateral traignel
split it up into
base 18/2=9
hypotonuse 15
height=?
9^2+x^2=15^2
81+x^2=225
x^2=144
x=12

height=12
add

radis=15
height=12
15+12=27
27 cm

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Step-by-step explanation: