Question

The perimeter of the given triangle is 12 cm. Find the measure of the side AB.

• A. 7 cm
• B. 4.5 cm
• C. 4 cm
• D. 6 cm

Answer 1

The correct option is C 4 cm

Given:

• AC = $5cm$ and BC = $3cm$
• Perimeter of $\Delta ABC$ = $12cm$

Let the length of the side AB = $x$ units
Now,
Perimeter of a triangle = Sum of lengths of all the sides
$\therefore 12=3+5+x$
$\Rightarrow x=[12-(3+5\left)\right]$
$=(12-8)=4\text{cm}$
Hence, the measure of side $AB=4cm$