Question

The perimeter of the figure given below is 15 cm. Find the length of the third side.

• A. 6 cm
• B. 11 cm
• C. 5 cm
• D. 4 cm

Answer 1

The correct option is D

4 cm

Given : Perimeter of the given figure = 15 cm
Let the length of the third side be x.
Perimeter of a figure = Sum of lengths of its sides = AB + BC + AC
$\Rightarrow$ 15 cm = 6 cm + 5 cm + x
$\Rightarrow$ 15 cm = 11 cm + x
$\Rightarrow$ x = 15 cm - 11 cm
$\Rightarrow$ x = 4 cm
Therefore, the third side is 4 cm long.