What is the perimeter of an isosceles triangle when the length of one of the equal sides = 5 cm and base = 8 cm?

10

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18

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Solution

The correct option is D $18$ cm
An isosceles triangle is a triangle that has two sides of equal length.
Here, $A B = A C = 5$ cm and base, $B C = 8$ cm

The perimeter of a triangle can be calculated by adding the lengths of all the sides.
The perimeter of the given triangle $= A B + B C + C A$
$= 5 + 8 + 5$
$= 18$ cm
Hence, option (d.) is the correct choice.

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