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= √13²-(8-3)²
= √169-25
= √144
=12
L.trap = luas sisi sejajar × tinggi / 2
= 3+8/2 × 12
= 11/2 × 12
= 66
jadi, jawabnnya C
luas trapesium= jumlah sisi sejajar x tinggi/2 = (8+3) x 12/2 = 11 x 6 = 66 cm kuadrat