Final answer:
To draw the involute of a circle when unwinding a rope with a circle diameter of 40mm, start by drawing a circle with a diameter of 40mm. Then, draw a tangent and a normal to the circle that are 100mm away from the center of the circle.
Step-by-step explanation:
To draw an involute of a circle, we first need to understand what an involute is. An involute is a curve traced by the end of a string that is unwound from a fixed cylinder. The involute of a circle is a specific type of involute that is formed by unwinding a rope from the circumference of a circle.
To draw an involute of a circle, we need to know the diameter of the circle. In this case, the diameter is given as 40mm. We can start by drawing a circle with a diameter of 40mm. Next, we can draw a tangent and a normal to the circle. The tangent and normal should be 100mm away from the center of the circle.