1. Midterm Math 10 Review
Question 20: Answer

2. Step One: Read the question…
“Calculate the angle of inclination, to the nearest tenth of a degree, of a road with the grade of 22%.
Answers:
77.3* B) 77.6* C) 12.4* D)12.7*
Side Note: I am using the * sign as the degree sign.

3. Step Two: Find out what a ‘Grade’ is:
Grade: the tangent of a triangle (the slope) as a percentage, that has been converted from a fraction.
So… You have to divide the opposite by the adjacent of the angle you are trying to find out. *

4. Step Three: So to find out the angle of inclination, you
have to to use the inverse tangent sign.
So…
angle of inclination = inverse Tan (0.22) = ….

5. Step Four: Round 12.407* down to get 12.4*
So therefore, the answer is question is:
“The angle of inclination of the triangle is 12.4*.”
12.4* which is also C) on your package.