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A certain lake has an irregular shape. In order to estimate the area, the North-South distance across the lake is measured every 100 feet down an East-West line. The results are shown in the table below. Use an appropriate technique to estimate the number of acres that the lake covers. Give a complete explanation of how you computed the area.

East-West position (ft)	Distance across lake (ft)
0	900
100	1500
200	1800
300	2000
400	2500
500	2700
600	2700
700	2700
800	2700
900	2700
1000	2700
1100	2700
1200	2700
1300	2700
1400	2600
1500	2600
1600	2600
1700	2600
1800	2600
1900	2600
2000	2500
2100	2500
2200	2500
2300	2500
2400	2500
2500	2500
2600	2400
2700	2300
2800	2300
2900	1800
3000	1600
3100	1500
3200	1400
3300	1400
3400	1300
3500	1300
3600	1100
3700	800
3800	0

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