Question

In the accompanying diagram, point P(0.6, −0.8) is on unit circle O. What is the value of θ, to the nearest degree?

Answer 1

Answer:

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Answer 2

ANSWER:

To find the size of the angle when you know the cos, use cos-1(0.324).

On hand-held calculators use (2nd) (cos) , enter 0.324 to get the answer: 71.1°.

On this calculator, use (2nd) (acos) and then enter the value.

“acos” means “arc cos”, which is the inverse cosine.

Similarly, find sin-1(0.123) and tan-1(0.783), using (2nd) (asin) and (2nd) (atan).