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anonymous
 one year ago
A circle has its center at the origin, and (5, 12) is a point on the circle. How long is the radius of the circle?
5
12
13
anonymous
 one year ago
A circle has its center at the origin, and (5, 12) is a point on the circle. How long is the radius of the circle? 5 12 13

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zzr0ck3r
 one year ago
Best ResponseYou've already chosen the best response.0You want the distance from that point to the origin. Do you know how to find the distance between two points?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dw:1433281453913:dw Simply use the triangle formula for perpendicular triangles, which says: \[c^2 = a^2 + b^2\] Where c is hyphotenus, a and b are sides. In here \[r^2 = 12^2 + 5^2 = 169\] \[r = \sqrt{169} = 13\]

campbell_st
 one year ago
Best ResponseYou've already chosen the best response.0well a simple method is to know the standard form of the equation of the circle \[(x  h)^2 + (y  k)^2 = r^2\] (h, k) is the centre... so substitute the given values then substitute the point this will allow you to calculate r^2 and then r... the radius... hope it helps
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