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1) Cari panjang segitiga yang belum diket
b= √c²-a²
= √15² - 12²
= √225 - 144
= √81 = 9
24 - 9 = 15
a. L1= 12 × 9 ÷ 2 = 54
L2 = 12 × 15 = 180
L total = 180 + 54 = 134
b. K = 15 + 24 + 12 + 15 = 62
2) a. L1 = Л × r² × 1/2
= 22/7 × 7 × 7 × 1/2
= 77
L2 = p × l
= 20 × 14 = 280
L total = 280 + 77 - 357
b.
K = ((20 + 14)×2) + (22/7 × 14)
= 68 + 44 = 112