Question

An acute angle θ is in a right triangle with cos θ = nine tenths. What is the value of sec θ?

Answer 1

can you write sec(theta) in terms of cos(theta)?

Answer 2

well, there is a co-relation between sec and cos.
\[\sec \theta = \frac{ 1 }{ \cos }\]

now you should be able find sec theta

Answer 3

do you feel that you can do it yourself.

Answer 4

@zoeg are you following me:)