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11-69.

A rectangle has one side of length mm and a diagonal of mm. Draw a diagram of this rectangle and then determine its width and area.

Use the Pythagorean Theorem to solve for b.
After solving for b, find the area of the rectangle.

A rectangle with the width is labeled 11 millimeters.  A diagonal line from one corner to another is labeled 61 millimeters.

A rectangle with the width is labeled 11 millimeters and the length labeled, b.  A diagonal line from one corner to another is labeled 61 millimeters.