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Home > CCA2 > Chapter 7 > Lesson 7.1.7 > Problem 7-110


Compute without a calculator For angle in the third quadrant, . Use this information to find each of the following values without using calculator.

Draw a unit circle and label the triangle for the given angle.Unit Circle, with right triangle, hypotenuse from center, to a point, in third quadrant, on the circle, vertical leg, from point on circle, perpendicular to negative, x axis, horizontal leg, labeled negative 12 thirteenths, is a portion of negative, x axis.

Find the missing side of the triangle using the Pythagorean Theorem.
Use the missing side to evaluate the given trig ratios.
Remember that both are negative in the third quadrant.