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Saturday, April 1, 2017

Angle between two intersecting circles

Angle of intersection of two circles:

The angle of intersection of two circles is defined as the angle between the tangents to the two circles at their point of intersection.

Let x² + y² + 2g₁x + 2f₁y + c₁ = 0, 

x² + y² + 2g₂x + 2f₂y + c₂ = 0


Orthogonal Circles:

Two circles are said to be intersect orthogonally, if their angle of intersection is right angle.

cos (CPC) = 0

C₁P² + C₂P² - C₁C₂² = 0

g₁² + f₁² - c₁ + g₂² + f₂² - c₂ = g₁² - 2g₁g₂ + 2f₁f₂ + f₂² + f₁² + g₂²

2 (g₁ g₂ + f₁ f₂) = c₁ + c₂

This is the condition for orthogonality of circles.

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