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a)
a√2=6√6
a=6√3
H=a=r
v=·π(6√3)²·(6√3)=36·6√3π=216√3π
b) 20=2a
a=10=H
a√3=r
r=10√3
v=·π·(10√3)²·10=·100·3π=1000π
h=L·sin45=L·√2/2
r=L·cos45=L·√2/2
V=1/3·πr²·h=1/3·L²/2·L·√2/2=1/12π·L³·√2=1/12·216·6·√6=108π√12=216π√3
2.DANE: L=20 α=60
h=L·cosα
r=L·sinα
V=1/3·πr²·h=1/3·L³·sin²α·cosα=1/3·π·8000·3/4·1/2=1000π
Pozdr
J