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q=120
h=72
P= 1/ *p*q = 1/2 * a * h
P = 1/2 *90*120= 60*90 = 5400cm2
P = 1/2 *a*h
5400 = 1/2 *a* 72
5400 = 36 * a / :36
a = 5400: 36= 150 cm