Asked by emma
Point P (a, -2/5) is located in the third quadrant on the unit circle. Determine the exact value of a. Show your work.
Answers
Answered by
oobleck
it's the unit circle, so x^2 + y^2 = 1
a^2 + 4/25 = 25/25
a^2 = 21/25
a = -√21/5
a^2 + 4/25 = 25/25
a^2 = 21/25
a = -√21/5
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