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Lesson Posted on 18/08/2018 Circles

Raj Kumar

I am Six Sigma Black belt trained from American Society of Quality I am 2011 pass out in B.tech from...

The equation of a circle with its centre at C(x0, y0) and radius r is: (x – x0)2 + (y – y0)2 = r2 If x = y0 = 0 (i.e. the centre of the circle is at origin) then equation of the circle reduce to x2 + y2 = r2. If r = 0 then the circle represents a point or a point... read more

The equation of a circle with its centre at C(x0, y0) and radius r is:

(x – x0)2 + (y – y0)2 = r2

If x = y0 = 0 (i.e. the centre of the circle is at origin) then equation of the circle reduce to x2 + y2 = r2.

If r = 0 then the circle represents a point or a point circle.

The equation x2 + y2 + 2gx + 2fy + c = 0 is the general equation of a circle with centre

Equation of the circle with points P(x1, y1) and Q(x2, y2) as extremities of a diameter is

(x – x1) (x – x2) + (y – y1)(y – y2) = 0.

For general circle, the equation of the chord is x1x + y1y + g(x1 + x) + f(y1 +y) + c = 0

For circle x2 + y2 = a2, the equation of the chord is x1x + y1y = a2

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Find the length of the tangent from a point which is at a distance of 5 cm from the centre of the circle of radius 3 cm?

Tanay Likhar

Math Mentor

So, if you draw a circle it will form a right angle triangle with hypotenuse 5 cm and base 3 cm. using Pythagoras theorem, the length will be equal to 4 cm.
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If non-parallel sides of a trapezium are equal, prove that it is circle?

If two equal chords of a circle intersect, prove that the parts of one chord are separately equal to... read more
If two equal chords of a circle intersect, prove that the parts of one chord are separately equal to the parts of the other chord? read less

Prove that the intercept of a tangent between two parallel tangents to a circle subtends a right angle at the centre?

What do you mean by tangents of a circle?

What do you mean by Chords of a circle?

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