Hello, I am a high school student, and I am a new member to this forum. I was wondering how to find the area under the graph of one sin arc without using calculus. The problem comes from something one of my friends gave me. The question shows a picture with some rectangles in the space underneath the curve. I was thinking if i drew a large, scaled version and filled it with many rectangles i would be able to approximate the area. the key point to my question is that calculus is not involved. Are there any methods that are less demeaning than drawing tons of little rectangles? What are they?