Question

Select all angles that have a cosine of 3/5.

Answer 1

Explanation:

Given

Two similar triangles i.e.
`\trianle ABC \ \text{and}\ \triangle A'B'C'`

from the figure, In
`\triangle ABC`

`\Rightarrow \cos \alpha=(AC)/(AB)=(3)/(5)`

Also, In
`\triangle A'B'C'`

`\Rightarrow \cos \alpha =(A'C')/(A'B')=(6)/(10)=(3)/(5)`