Eliminate the parameter to obtain the equation of a circle

The video tutorial focuses on eliminating the variable T from an equation to express it solely in terms of X and Y. Initially, the instructor discusses the challenges of solving for T using cosine and inverse functions. The lesson then shifts to using trigonometric identities, specifically sine squared plus cosine squared equals one, to derive the equation of a circle. The tutorial concludes with a review of basic geometry concepts related to circles, including the center and radius.

What does the equation X^2 + Y^2 = 16 represent?

What is the radius of the circle represented by the equation derived?