Find the area of this circle

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4