If sin(Ф)=3/5, and cos(Ф)=-4/5, which of the following is true?
a.) sin((π/2)-Ф)= 4/5
b.) cos((π/2)-Ф)=-3/5

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?

Polygon abcde is reflected to produce polygon a′b′c′d′e′. what is the equation for the line of reflection?