This drawing incorporates three tangent arcs. By utilizing CAD commands and drawing auxiliary lines, we can precisely determine the circle’s center, facilitating the creation of intricate shapes with ease.

Steps:

- Draw a circle with a radius of 35.
- Sketch the contour line at the bottom left corner.
- Offset it upwards by 38 units and draw auxiliary lines to locate the middle arc.
- Draw a circle with a central radius of 25 using the CircleTTR command. Make it tangent to the circle and auxiliary line on the left.
- Prepare to draw the rightmost arc. Since the distance between the centers of the two circles is 60 units, use the middle circle as the center and draw a circle with a radius of 60 as the auxiliary line.
- Draw a vertical line at the right end of the straight line, intersecting the circle with a radius of 60, to determine the position of the circle’s center.
- Draw a circle with a radius of 35. Once the rightmost circle is drawn, remove the auxiliary line.
- Apply a fillet of 15. Use the TTR command to draw a tangent circle with a radius of 75.
- Trim the necessary elements and add annotations as required.