Question

The perimeter of an equilateral triangle is $30cm$. Find the side length.

• A. $12cm$
• B. $15cm$
• C. $10cm$
• D. $8cm$

Answer 1

The correct option is C $10cm$

The perimeter of a triangle is the sum of the length of its three sides.

So, the perimeter of an equilateral triangle $=\text{Side}+\text{Side}+\text{Side}$ [Length of all three sides of an equilateral is the same]

$\Rightarrow 30=3\times \text{Side}$

$\Rightarrow \text{Side}=\frac{30}{3}$

$\Rightarrow \text{Side}=10cm$

Therefore, option B is the correct answer.