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b=20 cm
α=30⁰
sin30⁰=h/b
1/2=h/20
h=10 cm
(1/2 a)²+10²=20²
(1/2 a)²=400-100
(1/2 a)²=300
1/2 a=√300
1/2 a=10√3 cm
a=20√3 cm
P=1/2 a *h
P=10√3*10
P=100√3
P=1/2 b*H
100√3=10H
H=10√3 cm dwie równe spadające na ramiona