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# What is the formula of common tangent?

## What is the formula of common tangent?

For finding direct common tangents of two circles, find the point P dividing the line joining the centre externally in the ratio of the radii. Equation of direct common tangents is SS1 = T2 where S is the equation of one circle.

### What is a common tangent?

A line which is tangent to more than one circle is called a common tangent. The tangents can be classified into common tangents that are internal and external. An internal tangent is a line segment, which passes through the centre of the two circles whereas the external common tangents do not.

#### What is Traverse common tangent?

A common tangent is called a transverse common tangent if the circles lie on opposite sides of it. YZ is the other transverse common tangent as the circle with centre O lies above it and the circle with centre P lies below it. A transverse common tangent is possible only when the circles are apart.

Are common tangents equal?

The two direct common tangents drawn to two circles are equal in length. Given: WX and YZ are the two direct common tangents drawn to the two given circles with centres O and P.

How many common tangents do two circles have?

four common tangents
In most cases, two circles have four common tangents. If the circles are tangent , then they will have three common tangents, but this can be understood as a degenerate case: as if the two tangents coincided.

## How do you find the direct common tangent and transverse common tangent?

The direct common tangents meet on the line passing through centres and divide it externally in the ratio of the radii. The transverse common tangents meet on the line passing through centres and divide it internally in the ratio of the radii.

### Whats a no common tangent?

No Common Tangent: If one circle line completely inside another circle without cutting or touching it at any point then the circles will have no common tangent. Three Common Tangents: If two circles touch each other externally at one point, they will have three common tangents.

#### What is a common internal tangent?

A common internal tangent of two circles is a tangent of both circles that intersects the segment joining the centers of two circles.

How do you find the transverse common tangent?

The length of a transverse common tangent to two circles is √d2–(r1+r2)2, where d is the distance between the centres of the circles, and r1 and r2 are the radii of the given circles.

What is a no common tangent?

## How many common tangents do non concentric circles that do not intersect have?

Two circles may intersect or lie entirely one within or without the other. If one of the circles lies inside the other, the two have no common tangents.

### What does inverse tangent mean?

inverse tangent – the inverse function of the tangent; the angle that has a tangent equal to a given number.

#### How do you calculate the tangent angle?

With just the opposite and adjacent sides, you can calculate the angle at the base of the ladder using the arctangent function. If the wall (opposite) side is 10 feet, and the ground (adjacent) side is 5 feet, the formula for the tangent angle is the opposite side divided by the adjacent side. This is 10 divided by 5, or 0.5.

What is the difference between tangent and sine?

tangent | sine |. is that tangent is (geometry) a straight line touching a curve at a single point without crossing it there while sine is (trigonometry|mathematics) in a right triangle, the ratio of the length of the side opposite an angle to the length of the hypotenuse.

What does inverse cotangent mean?

The six important trigonometric ratios are sine, cosine, tangent, cosecant, secant and cotangent. The inverse of these functions is called the inverse trigonometric function. The inverse of the cotangent function is called inverse cotangent or arccot. It is denoted by cot-1 x.