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panjang DC
DC = 20 -6 - 6
= 20 - 12
= 8 cm
luas trapesium
L =(a+b) x t : 2
= ( 8 + 20 ) x 8/2
= 28 x 4
= 112 cm²
= √64
= 8 cm
b. 20 - 12 = 8 cm
c. L trap = 1/2 (a+b)xt
= 1/2 (20+8)x 8
= 1/2 x 224
= 112 cm²