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1) A circle has centre (0,0). The point (15 , 8) is a point on the circle. Find the equation of the circle.

 Jan 15, 2019
edited by MathsGod1  Jan 15, 2019
 #1
avatar+4691 
+3

(15,8) is the distance from centre to circumference aka the radius.

 

Create a right angle triangle around the points and work out the radius,

 

a^2+b^2=c^2

 

15^2+8^2=289

 

sqrt(289)=17

 

x^2+y^2=17

 

sorry went brain blank a second

 Jan 15, 2019
 #2
avatar+18337 
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I think you made a typo....

 

x^2 + y^2 = 17^2

ElectricPavlov  Jan 15, 2019

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