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pp=25cm²
2*25cm²=50cm²
276cm²-50cm²=226cm²
pb=5cm*h*4
pb=20cm*h
276cm²=50cm²+20cm*h |-50cm²
226cm²20cm*h |:20cm
h=11,3cm
v=pp*h
v=25cm²*11,3cm
v=282,5cm³
Pc = 2Pp + 4aH
2Pp + 4aH = 276
2a² + 4aH = 276 dla a = 5:
2x5² + 4x5xH = 276
50 + 20H = 276
20H = 276 - 50
20H = 226 → H = 11,3 cm
V = Pp x H = 5² X 11,3 = 282,5 cm³