Posted by **Kelly** on Saturday, June 28, 2008 at 9:44pm.

if the tangent of two intersecting circles, at their points of intersection are perpendicular, the circles are said to be orthogonal.

Show that the circles x^2+y^2-6x+4y+2=0 and x^2+y^2+8x+2y-22=0 are orthogonal.

find the equation of the tangent to the ellipse x^2/a^2 + y^2/b^2 =1 at the point (a cos theta, b sin theta)

show that the equation of the tangent to the ellipse x^2/a^2 + y^2/b^2 =1 at the point (x1, y1) is xx1/a^2 + yy1/b^2 = 1.

## Answer this Question

## Related Questions

- trig - Two circles of radii 5 and 3 cm, respectively, intersect at two points. ...
- Geometry/Trigonometry - Circles with centers (2,1) and (8,9) have radii 1 and 9...
- GEOMETRY - Two circles with radii a and b touch each other externally . Let c be...
- Geometry - Circles and tangents - Two circles of radius 1 are externally tangent...
- math - Verify that the circles x2+y2 = 25 and (x−5)2+(y−10)2 = 50 ...
- maths - Two circles with centers a and b of radii 3 cm and 4 cm res , ...
- AP Calculus - Two circles of radius 4 are tangent to the graph of y^2=4x at the ...
- AP Calculus - I asked this yesterday and someone answered. but i didn't ...
- math - Two circles of radius 4 are tangent to the graph of y^2=4x at the point (...
- MATHS - two circles c1 and c2 meet at the points A and B. CD is a common tangent...

More Related Questions