CPM Homework Help : CCA2 Problem 7-96

Angle A is an obtuse angle with a sine of $\frac { 3 } { 10 }$ . What is the tangent of angle A?

Hint:

Draw this angle in a unit circle. In which quadrant(s) is sine positive?

Diagram:

More Help 1:

Find the missing side of the triangle with the Pythagorean Theorem.
Remember that in a unit circle some sides are negative.

More Help 2:

Tangent is $\frac{\text{opposite side}}{\text{adjacent side}}$ .

Your answer should be negative.

Unit Circle, with right triangle, line segment from center, to point in second quadrant, on circle, is hypotenuse, labeled 1, vertical leg, from point on circle, perpendicular to negative, x axis, labeled, 3 tenths.