Microsoft Word - lecnote_fm_engineering drawing

Step 2: Set off the radius of the required circle on the
perpendicular.

Step 3: Draw circle with radius CP.

Figure 4.23 Example on how to draw a tangent to a line

P. To Draw a Tangent to A Circle through a Point

Method-1

Given: Point P on the circle.
Move the T-square and triangle as a unit until one side of the
triangle passes through the point P and the center of the
circle; then slide the triangle until the other side passes
through point P, and draw the required tangent.

Method-2

Given: Point P outside the circle
Move the T-square and triangles as a unit until one side of the
triangle passes through point P and, by inspection, is the
tangent to the circle; and then slide the triangle until the other
side passes through the center of the circle, and lightly mark