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P = [(a+b)×h]:2
P = [(12+6)×4]:2
P = (18×4):2
P = 36 cm^2
O = 12+5+6+5 = 28cm
2.
Wzór na pole rombu mając przekątne: P = ef/2
Wzór na pole rombu mając bok i wysokość: P = ah,
czyli:
ef/2 = ah
(12×16):2 = 10h
96 = 10h
h = 9,6 cm