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The radius of the in circle of a triangle is 4cm and the segments into which one side is divided by the point of contact are 6cm and 8cm. Determine the other two sides of the triangle.(Ans: 15, 13)
Ans: a = BC = x + 8
b = AC = 6 + 8 = 14cm
c = AB = x + 6
Semi - perimeter = a + b + c/2
= BC + AC + AB/2
= x + 8 +14 + x + 6/2
= 2 x + 28/2
= x + 14
= √( x + 14)(48x) .................(1)
Area of ΔABC = area ΔAOB + area BOC + area ΔAOC
area ?AOC = ( 1/2b.h) = 1/2 x 4 x 14
= 28
On substituting we get
∴ area ΔABC = area ΔAOC + area ΔBOC + area ΔAOB
= 4x + 56 ...............(2)
From (1) and (2)
4x + 56 =
Simplify we get x = 7
∴AB = x + 6 = 7 + 6 = 13cm
∴BC = x + 8 = 7 + 8 = 15cm
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