The measure of angle 1 in this question is 75 degrees.
What is a protractor?
An effective tool for measuring and drawing angles is a protractor.
How to use a protractor?
When we are measuring an angle from the right side then we always look at the inner scale of the protractor from the right side, but when we are measuring an angle from the left side of the protractor then we always look at the outer scale of the protractor.
Here, clearly we are measuring the angle 1 from the left side of the protractor so we will look at the outer scale of the protractor which will give the value of angle 1 as 75°.
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