Question

help

Answer 1

How can you use the two length values that are given, along with the basic trig identities, to make an equation for the angle R?

Answer 2

You are aware of \[\sin , \tan , and \cos ?\]

Answer 3

yes

Answer 4

so which one of those, when looking at them from the angle R, uses both of the length values that are given?

Answer 5

cos?

Answer 6

What is 21 from angle R (opp, adj, or hyp)?

Answer 7

Since T is the right angle, the side opposite of it is the hypotenuse.

Answer 8

So where is the side of length 21 with respect to the angle R?

Answer 9

Opposite or adjacent?

Answer 10

adjacent

Answer 11

adjacent means beside.

Answer 12

So that would make the side of length 21 what with respect to angle R?

Answer 13

Notice how that side is "across" from angle R?

Answer 14

You could say that it is opposite to it.

Answer 15

So what does that make the side of length 20 with respect to angle R?