find the circumference and area of the circle x*x+y*y-6x-8y+15
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eq. of circle ≡ x² + y² - 6x -8y +15 = 0
= x² - 6x +9 + y² - 8y +16 = -15 +16 +9
= (x-3)² + (y-4)² = 10
so center of circle C : ( 3 ,4) and radius = √10
so circumference = 2πr = 2π√10 and area= πr² = 10π
hope this helps
= x² - 6x +9 + y² - 8y +16 = -15 +16 +9
= (x-3)² + (y-4)² = 10
so center of circle C : ( 3 ,4) and radius = √10
so circumference = 2πr = 2π√10 and area= πr² = 10π
hope this helps
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