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Use the CAST diagram to determine which quadrant is the cos B in. After determining your quadrant, since cos = ADJ/HYPO, you can fill in the values of the triangle as shown. I have provided the solution for question 1. The rest of the questions follow the same operation. Hope it helps!
*How to know cos B is in the 1st Quadrant?*
It is given that cos B = p/2 , notice it is positive? Hence, it can only be either in the 1st or 4th quadrant.
To choose between these two, look at the other information given = ACUTE. Hence, cos B has to be in the 1st quadrant.
*How to know cos B is in the 1st Quadrant?*
It is given that cos B = p/2 , notice it is positive? Hence, it can only be either in the 1st or 4th quadrant.
To choose between these two, look at the other information given = ACUTE. Hence, cos B has to be in the 1st quadrant.
Date Posted:
6 years ago
Thank youu