# Using upper and lower sums to approximate the area.

1. Feb 5, 2012

### Phyzwizz

Never Mind

I answered my own question two minutes after posting it. I don't know how to take this question down so I just deleted it.

Last edited: Feb 5, 2012
2. Feb 5, 2012

### Staff: Mentor

Forget about i, which is used in more general presentations. Your interval [0, 1] is divided into four equal subintervals, each of length 1/4. For an upper sum or a lower sum, you need to find the area of four rectangles of width 1/4 and height, the square root of one of the subinterval endpoints.

Draw a sketch if you haven't already done so. In fact, draw two sketches, one for your lower sum and one for your upper sum.