# How to find the perimeter of a right angle triangle with one side missing ?

A perimeter is defined as total length of a triangle around the shape.

## Answer: Using pythagoras theorem, we can find other side and perimeter of triangle = a+b+c, if a,b and c are sides of triangle.

Find missing side and perimeter

**Explanation:**

Find missing side and perimeter if hypotenuse side is 5 units and base side is 4 units.

Using pythagoras theorem, if 'a' and 'b' are sides of a right angle triangle and 'c' is hypotenuse side

Then, c^{2} = a^{2} + b^{2}

5^{2} = 4^{2} + b^{2}

25 = 16 + b^{2}

9 = b^{2}

b = 3

The other side is 3 units

Now, perimeter of triangle = a+b+c

P = 3 + 4 + 5

P = 12

Perimeter = 12 units