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= 13² - (8 - 3)²
= 169 - 25
CD = √144
= 12 cm
Perhatikan gambar!
AF = AD - BC
= 8 - 3
= 5 cm
L ABCD = L BCDF + LΔABF
= BC x CD + 1/2BF x AF
= 12 x 3 + 1/2 x 5 x 12
= 36 + 30
= 66 cm²
Jadi luas trapesium ABCD adalah 66 cm²