The area of a triangle is base times height divided by . You can use the first triangle to solve for the height: means that . The larger triangle is proportional to the smaller one. In fact, it is times larger. This means that the height of the larger triangle is . Putting all of this together, you can then calculate the area: .
you divide 250 by 15 to get the amount of rotations per month, then once you get that answer which is 16.6666667, you then multiply that number by 9 and there is your answer
