Question

My textbook doesn't explain sines or cosines at all. It barely touches on tangents. Please, please, please help me if you can!!

Complete the following list:
sin A=a/c, sin B=?
cos A=?,cos B=?, a^2+b^2=?
tan A=? and tan B=?

Diagram in the comments.

Answer 1

the sine of an angle just means the side opposite the angle divided by the hypotenuse
\[\sin \theta =\frac{ opposite }{ hypotenuse }\]

Answer 2

the cosine of an angle just means the side adjacent the angle divided by the hypotenuse
\[\cos \theta=\frac{ adjacent }{ hypotenuse }\]

Answer 3

the tangent of an angle just means the side opposite the angle divided by the side adjacent the angle
\[\tan \theta=\frac{ opposite }{adjacent }\]

Answer 4

hope that helps!

Answer 5

Thank you!

Answer 6

sure:)

Answer 7

SOHCAHTOA :-)