Question

Suppose the length of AC in the triangle below is 15cm. The measure of angle A is 60, sim 60 ≈ 0.866, cos 60 ≈ 0.5 and tan 60 ≈1.73. Determine the length of AB

Answer 1

Explanation:

already

Answer 2

Answer: Option (4)

Explanation:

From the diagram, we know that

`\sin 60^(\circ)=(BC)/(15)\\\\\cos 60^(\circ)=(AB)/(15)`

This means we can eliminate options 1 and 2.

Now, if we multiply both sides by 15, we get

`15\cos 60^(\circ)=7.5`.

This gives us Option (4).