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Q.

Lengths of two sides of an isosceles triangle are 5cm and 8cm, find the perimeter of the triangle?

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a

15 cm or 24 cm

b

18 cm or 11 cm

c

18 cm or 21 cm

d

19 cm or 20 cm

answer is B.

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Detailed Solution

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Since the lengths of any two sides of an isosceles triangle are equal, then
Case I: The three sides of the triangle are 5 cm, 5 cm and 8 cm.
Perimeter of the triangle = 5 cm + 5 cm + 8 cm = 18 cm
Case II: The three sides of the triangle are 5 cm, 8 cm and 8 cm.
Perimeter of the triangle = 5 cm + 8 cm + 8 cm = 21 cm
Hence, the required perimeter is 18 cm or 21 cm.

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