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8² =d² -(7-1)²
64 =d² -36
64+36 =d²
100 =d²
d =akar 100 =10
grs sgng persk dalam =
AB²= d² -(r1+r2)²
AB² =10²-(7+1)²
AB² =100-64
AB² =36
AB = akar 36 = 6