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b=20cm
h=15cmH=?
kraw,podstawy =a
z pitagorasa
(1/2a)²+h²=b²
1/4a²+15²=20²
1/4a²+225=400
1/4a²=400-225
1/4a²=175
a²=175:¼=175·4=700
a=√700=10√7
z pitagorasa
(1/2a)²+H²=h²
(10√7/2)²+H²=15²
(5√7)²+H²=225
175+H²=225
H²=225-175
H²=50
H=√50=5√2 cm --->dl,wysokosci ostrosłupa