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### See 1 Answer

Angle ACB = 31+20 = 51 deg

tan 51 = 12/BC

BC = 12/(tan 51)

(b)

tan 31 = 12/BD

tan 31 = 12/(BC + CD)

BC + CD = 12/(tan 31)

CD = [12/(tan 31) ] - BC

(c)

Area = 0.5 x 12 x CD

Please use your calculator to work out the rest of the answers!