BC=10 cm,use the formula: Area of triangle/semi-perimeter of triangle= r, where "r" is the in-radius.Use hero's formula to find the area of the triangle, considering the reqd. side to be "x". You would get a quartic equation later on and that's the hardest part of the solution I feel and then you will get 10 cm as the answer.

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TopNewestsorry...i don't get it....why we are using the formula: Area of triangle/semi-perimeter of triangle= r??

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the answer is nearly 10 but accurate is 9.78

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No, the answer is exactly 10 cm.

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BC=10 cm,use the formula: Area of triangle/semi-perimeter of triangle= r, where "r" is the in-radius.Use hero's formula to find the area of the triangle, considering the reqd. side to be "x". You would get a quartic equation later on and that's the hardest part of the solution I feel and then you will get 10 cm as the answer.

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sorry...i don't get it....why we are using the formula: Area of triangle/semi-perimeter of triangle= r?? can you explain further?

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