Answer:
1. 33
2. 60
3. 145
4. 124
Step-by-step explanation:
Part 1:
The angle x, 79, and 72 must add up to 180 because they are the interior angles of a triangle; therefore,
which can be written as
subtracting 151 from both sides gives
which is our answer!
Part 2.
By exterior angle theorem, the angle 125 is equal to x + 65
Solving for x gives
which is our answer!
Part 3:
The leftmost interior angle is 180 - 125 = 55
The top interior angle is 180 - 90 = 90
The sum of the leftmost interior and the top interior is 55 + 90 = 145
Therefore, by Exterior angle theorem
x = 145
which is our answer!
Part 4:
By exterior angle theorem
which is our answer!