Do 72_16 u should probably get the answer
Answer:
Formula to find height when given diameter and slanted height

First find the radius
24÷2=12
Next square the radius
12²=144
Next square the slanted height
20²=400
Now find the square root of both

=16ft
4 1/2 = 9/2
8 1/4 = 33/4
1/3 x 9/2 = 3/2
1/3 x 33/4 = 33/12
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