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Lp = 2 × (20 × 6 + 20 × 10 + 6 × 10)
Lp = 2 × (120 + 200 + 60)
Lp = 2 × 380
Lp = 760 cm2
Jawaban: C
55. ∠A = 14 × (180 - ∠A)
∠A = 2520 - 14∠A
∠A + 14∠A = 2520
15∠A = 2520
∠A = 2520 : 15
∠A = 168°
Jawaban: D