Types of Triangles: Calculate The Missing Side based on the formula

Question 1

Look at the isosceles triangle below:

The perimeter of the triangle is 50.

What is the value of X?

Question 2

The perimeter of the triangle ABC is equal to 50 cm.

Work out the value of X using the data in the figure below.

Question 3

The perimeter of triangle ABC is 42 cm.

Calculate X.

Examples with solutions for Types of Triangles: Calculate The Missing Side based on the formula

Look at the isosceles triangle below:

The perimeter of the triangle is 50.

What is the value of X?

Since we know the triangle is isosceles, the other side will also be equal to X

Now we can replace the data to calculate X.

The perimeter of the triangle is equal to:

$x+x+5.6=50$

$2x=50-5.6$

$2x=44.4$

We divide both sides by 2:

$\frac{2x}{2}=\frac{44.4}{2}$

$x=22.2$

22.2

The perimeter of the triangle ABC is equal to 50 cm.

Work out the value of X using the data in the figure below.

22.2

The perimeter of triangle ABC is 42 cm.

Calculate X.