Question

Find the missing angle.

Answer 1

Answer:

X = [68]°

Step-by-step explanation:

We know that a triangle has 180 degrees in it from the total angle measure  formula:

    m = 180(n-2)

Where n equals the number of sides a shape has and m is equal to the sum of interior angle measures.

    m =  180(3-2)

         =  180(1)

         =  180

So if we know two  of the angle measures, we can add them then subtract that from the total angle measure to get x.

      180-(72+40) = 68

TL;DR -   Add the known angle measures and subtract them from the total angle measure to get the third missing angle.

Hope this helps :)

Answer 2

Answer:

x=68

Basic fact:

angles in a triangle add up to make 180 degrees

Step-by-step explanation:

we know that

72+40+x=180

112+x=180

-112

x=68