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The lengths of the sides of a triangle are in integers and its area is also an integer. One side is 21 cm and the perimeter is 48 cm, then the length
Question

The lengths of the sides of a triangle are in integers and its area is also an integer. One side is 21 cm and the perimeter is 48 cm, then the length of the shortest side is

A.

8 cm

B.

10 cm

C.

12 cm

D.

14 cm

Correct option is B

Given:

The sides of the triangle are integers.

The area of the triangle is an integer.

One side = 21 cm.

Perimeter = 48 cm.

We need to find the shortest side.

Solution:

a + b + c = 48

a + b + 21 = 48

a + b = 27

a = 10, then b = 17:

Checking the triangle inequality:

10 + 17 > 21

10 + 21 > 17

17 + 21 > 10

The shortest side is:

10\boxed{10}

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