Originally Posted by

**Maccabhoy** Hey Masters, thanks for the reply. Not sure you have answered the question.... But that's my fault, as I think my explanation isnt the best. I'll try to copy and paste the question direct (As you will see, I got the answers for 8.1 and 8.2 correct and just need 8.3)

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What angles (in radians) in have a cosine of

1/2?

Your angles should be given *exactly*. Recall that π is entered as: pi or Pi.

**8.1** (1 mark)

Angle in 1st quadrant:

Your last answer was:

1/3 π

Your answer is correct.

The mark for your last attempt was 1.00

**8.2** (1 mark)

In which quadrant is the other angle whose cosine is 1/2 ?

Answer 2 for 2nd quadrant, 3 for 3rd quadrant, or 4 for 4th quadrant.

**Note:** penalties for wrong answers are higher than usual. *Don't just guess!*

Answer:

Your last answer was:

4

Your answer is correct.

The mark for your last attempt was 1.00

**8.3** (1 mark) Angle not in 1st quadrant: