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d2 = 8 + 8 = 16 cm
Dit : K dan L
Jawab : L = d1 × d2 / 2 = 21 × 16 / 2 = 168 cm²
K = 10 + 10 + 17 + 17 = 20 + 34 = 54 cm
Luas=1/2x16x21
Luas=168cm persegi
Kell= 10+10+17+17=54cm