Use the image below to answer the following question. Find the value of sin x° and cos y°. What relationship do the ratios of sin x° and cos y° share?

enter image source here

1 Answer
Feb 7, 2018

See below.

Explanation:

Form the diagram:

By Pythagoras's theorem:

#PO^2=12^2+5^2=169#

#PO=sqrt(169)=13#

#cos(y)=5/13#

#sin(x)=5/13#

The ratios are the same

This is true for all right triangles.

enter image source here

From diagram:

#sin(alpha)=a/c#

#cos(beta)=a/c#

#sin(beta)=b/c#

#cos(alpha)=b/c#

For all right triangles:

#sin(theta)=cos(90^@-theta)#