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Question

ABC is a triangle such that AB=15 cm and AC=5 cm. The side BC lies between and .

A
10
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B
20
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C
8
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D
12
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Solution

The correct options are
A 10
B 20
We know that sum of two sides is always greater than the third side.
AB + AC > BC,
since AC = 5 cm and AB = 15 cm
that means BC < 15 cm

Also, the difference between the lengths of any two sides of a triangle is always less than the third side.
AB - AC < BC,
since AC = 5 cm and AB = 15 cm
that means BC > 10 cm

The side BC lies between 10 and 20.

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