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McGraw Hill Glencoe Geometry, 2012

MH

McGraw Hill Glencoe Geometry, 2012 View details

1. Areas of Parallelograms and Triangles

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Exercise 48 Page 786

What is the standard form of an equation of a circle?

(x+3)^2+(y+10)^2=144

Practice makes perfect

Let's start by recalling the standard form of an equation of a circle.

(x- h)^2+(y- k)^2= r^2 In this form, ( h, k) is the center of the circle and r is its radius. We are told that the center of the circle is ( - 3, - 10) and its diameter is 24. The radius of a circle is half the length of the diameter so the radius of this circle is 12. This information is enough to write the equation. (x-( - 3))^2+(y-( - 10))^2= 12^2 ⇕ (x+3)^2+(y+10)^2=144

Subchapter links

Check Your Understanding p.783

Practice and Problem Solving p.783-785

H.O.T. Problems p.785

Standardized Test Practice p.786

Spiral Review p.786

Skills Review p.786