Find x in Triangle ABC: Given Angles 111° and 60°

Question

Calculate the value of $x$ .

00:00 Find X

00:06 Supplementary angle to 180

00:16 Sum of angles in a triangle equals 180

00:25 Collect terms and isolate X

00:42 And this is the solution to the question

Remember that a straight angle is equal to 180 degrees.

Therefore, we can work out that the angle measuring 111° and angle ACB form a straight angle.

Now let's calculate angle ACB as follows:

$ACB=180-111$

$ACB=69$

Then we can calculate $x$ .

Remember that the sum of angles in a triangle is equal to 180 degrees, therefore:

$X=180-69-60$

$X=51$