Answer:
There are different types of angles. They are as follows:
1) Acute angle - less than 90 degrees
2) Right angle - exactly 90 degrees
3) Obtuse angle - greater than 90 degrees but less than 180 degrees
4) Straight angle - exactly 180 degrees
5) Reflex angle - greater than 180 degrees
In part 1 they want you to identify what kind of angle is shown
Number 1 is 135 degrees
-It is not less than 90 degrees so it cannot be an Acute angle
-It is not exactly 90 degrees so it cannot be a Right angle
-It is not exactly 180 degrees so it cannot be a Straight angle
-It is not greater than 180 degrees so it cannot be a Reflex angle
-It is greater than 90 degrees and less than 180 degrees so it is in fact an Obtuse angle
For part 2 they want you to calculate the value of the missing angle
A straight line has 180 degrees so we can find the value of the missing angle by subtracting 135 degrees from 180 degrees
180 - 135 = 45
The missing angle is 45 degrees which is an Acute angle because it is less than 90 degrees
