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Kp = 2p + 2l
70 = 2x + 2(x-5)
70 = 2x + 2x - 10
70 - 10 = 4x
60 = 4x
x = 15 cm
2. L = (a + b).t/2
60 = (12 + 18)t/2
120 = 30t
t = 4cm
K = 5 + 12 + 5 + 18 =40 (gambar)
3. 1. cari rata2nya dulu (gambar)
2. Masukkin rumus simpangan baku (gambar)