Question

The perimeter of an isosceles triangle is $40$ units. If the length of one of the equal sides is $12$ units, what will the length of the third unequal side be?

• A. $52$ units
• B. $12$ units
• C. $24$ units
• D. $16$ units

Answer 1

The correct option is D $16$ units


An isosceles triangle has two equal sides.
Given, the length of one equal side $=12$ units
Sum of two equal sides $=12+12=24$ units
Length of side $3=$ perimeter - sum of two other sides
$=40-24$
$=16$
Therefore, the length of the third unequal side $=16$ units