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r=1/3 h
r=1/3*8√3/2=4/3*√3
P=πr²
P=(4/3*√3)²*π
P=16*3/9 π=16/3 π
2.
8 - przyprostokatna
x+3 - przyprostokatna
x+5 - przeciwprostokatna
(x+5)²=(x+3)²+8²
x²+10x+25=x²+6x+9+64
10x-6x=73-25
4x=48
x=12
12+3=15
P=1/2*8*15=4*15=60