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d2-16cm
P=1/2 * d1 * d2
P=1/2 * 30 * 16 = 30 * 8 = 240 cm2
(1/2d1)^2+(1/2d2)^2=c^2
(1/2*30)^2+(1/2*16)^2=c^2
15^2+8^2=c^2
225+64=c^2
c^2=289
c=17cm
P=a*h
240cm2=17*h |:17