A standard dartboard has a diameter of 18 in. What is... - Brainly.com

The meaning of the area **isthe** measurement **ofa** surface in this case a circle, which can be find by using the formula , where r is equal to the radius of the circle. In this exercise is given that **thediameterofa** standard cardboard is 18 inches or a radius of 9 inches and it is asked to find its area.

If the diameter of the dart board is 42 centimeters, what is... - Socratic

Explanation: The word to note here is "approximate". This implies that an accurate calculated answer with exact values is not required, but rather just a quick estimate. **Thediameter** is 42cm - that's close to 40cm.