Need some , missed two days of school totally in the dark with geometry, been doing pretty well with my homework but i'm not sure by what this means?
a right triangle has 90 degrees, or angle, i know a right angle has 90 degrees is that correct, i don't really understand the question

$12. that is my answer.

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.