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emmainna [20.7K]
3 years ago
11

Someone help please

Mathematics
1 answer:
tino4ka555 [31]3 years ago
4 0
305-35=270 (SA of 3 triangular faces)
270/3=90 (area of one face)
A=.5BH
90=.5(9)H
90=4.5H
H=20 in
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