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pakai pytagoras
jadi AB = 10 akar 2
ac = 1/2 ab
= 1/2 x 10 akar 2 = 5 akar 2
hitung pakai pytagoras lagi
sisi miring ada di OA
maka = akar 100 - 50 = akar 50 = 5 akar 2 (D)