2) Does the mapping diagram show a function?

the formula for the equation of a circle is (x – h)2+ (y – k)2 = r2, where (h, k) represents the coordinates of the center of the circle, and r represents the radius of the circle. if a circle is tangent to the x-axis at (3,0), this means it touches the x-axis at that point.

answer: both chords and diameters have two endpoints on a circle. diameters must intersect the center of a circle.

m∠a is 90°

m∠b is 40°