Find the equation of the tangent to the circle x 2 y 2 10x 2y 13 0 at the point -3 2. Textcolor red x2 textcolor limegreen y2 textcolor blue 42 x2 y 2 42. In this equation the letters h k and r are constants in other words their values are fixed.
Circumference pi d pi times 42 1319 textcm 1 dp The diameter is twice the length of the radius so the textradius 42 div 2 21 cm.
The equation of a circle of radius r centered at the point h k Think of this equation as the master template for every possible equation of a circle. Circle graphs for a circle have the general equation. P d 2 p r. The area of a rectangle with sides of 5 units and 10 units equals 50 square units.