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t = ST = (PQ - SR) : 2
= (14 cm - 6 cm) ; 2
= 8 cm : 2
= 4 cm
b. L = 1/2 x (jumlah sisi sejajar) x t
= 1/2 x (14 cm + 6 cm) x 4 cm
= 1/2 x 20 cm x 4 cm
= 40 cm²