Use the given triangles to evaluate the following expression. If necessary, express the value without a square root in the denominator by rationalizing the denominator.

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

We just started the introduction into circles and i have no idea how to do this.

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me