How could you determine the distance to the moon knowing only its diameter and having only a meter stick and a pen?

You can determine the distance to the moon using a method known as parallax. First, measure the diameter of the moon and hold the meter stick vertically at arm's length, creating a right triangle with the moon as one vertex. By moving the meter stick to two different positions and measuring the angle subtended by the moon at these positions, you can calculate the distance to the moon using basic trigonometry. The relationship between the diameter of the moon, the angles measured, and the distance will allow you to derive the moon's distance from Earth.