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h = 12 + 30 = 42cm
P = 1/2 x a x h
P = 6 x 42
P = 252
czyli
p=42*12*1/2=252:P
mam nadzijee że pomogłaaam; *
jus poprawione ;D
1/2 a * h = pole trójkąta
1/2 * 12 * 42 = 252cm (kwadratowe)