How Do You Know If Two Circles Are Tangent?
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Tangent circles have the same center. A tangent to a circle will form a rights angle with the radius that is drawn to the point of tangency. A chord of a circle is a diameter.
How do you find the point where a tangent touches a circle?
Find the gradient of the line from the centre of the circle to the point on the circle you need, then use that to find the gradient of the tangent. Finally, use y=mx+c with this gradient and the point on the circle it touches.
How do you join two circles?
The Joining of Two Circles. When a line intersects a circle in only one point that line is said to be tangent to the circle. An interesting characteristic about the tangent line to the circle is that is always perpendicular to the radius that goes through the point of tangency.