Two different methods are designed to measure the diameter of a dollar coin (which can be illustrated by a diagram). ____

Analysis Because the coin is round, it is difficult to measure its diameter directly with a scale. The diameter of a coin can be measured by placing two triangular plates vertically, placing the coin close to the triangular plates, and then making the ruler perpendicular to one of the triangular plates. Or wrap a thin wire around the coin, measure the circumference of the coin, and calculate the diameter with the formula of the circumference c = π d1. Method 1: Place two triangular plates vertically, place coins close to the triangular plates, and then measure the diameter of coins with a scale perpendicular to one of the triangular plates. Method 2: Wrap a thin wire around the coin, measure the circumference of the coin, and calculate the diameter with formula C = π d. Comment on this topic as an open topic, and there is no fixed answer. As long as it is reasonable, you can score it.