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

Exercise #1

Look at the isosceles triangle below:

5.65.65.6XXX

The perimeter of the triangle is 50.

What is the value of X?

Video Solution

Step-by-Step Solution

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 x+x+5.6=50

2x=505.6 2x=50-5.6

2x=44.4 2x=44.4

We divide both sides by 2:

2x2=44.42 \frac{2x}{2}=\frac{44.4}{2}

x=22.2 x=22.2

Answer

22.2

Exercise #2

The perimeter of triangle ABC is 42 cm.

Calculate X.

4X4X4X6X6X6XAAABBBCCC

Video Solution

Answer

3

Exercise #3

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

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

XXX5.65.65.6AAABBBCCC

Video Solution

Answer

22.2