Construct and Calculate Rectangles

1. Generate side lengths

• Click on the **New Dimensions** button (and wait 2 secs).

REMEMBER: You can always click on (top right) to undo your last action.

2. Make the base of your rectangle.

• Click on "Segment with** given length from point**" icon.

• Then click on the point A (it will glow) and In the box type the number of the base of your rectangle. Hit Enter.

3-4. Draw the sides of the rectangle. Remember, the base and sides of a rectangle are perpendicular.

• Click on "Perpendicular line" icon.

• Click on point A, then on line AB.

• Click on point B, then on line AB.

5. Now we need the point on the **left** line that is the height of the rectangle so we draw a circle with center A and radius the height of the rectangle. The intersection between the circle and the line is the point we need.

• Click on "Circle with **center and radius**" icon. Click on A and then type in the value of the** height** of your rectangle.

• line circle

6. Draw the top of the rectangle. Remember, the top and base are parallel.

• Click on "Parallel line" icon. Click on point C, then on line AB.

top lineright side.

7. Close your rectangle ACDB.

• Click on "Segment between two points" icon. Click on A and C. Click on C and then D. Click on D and then B.

8. Clean up

9. Notice how much shorter this construction was than the previous!

10. Play with your rectangle.

• Click and drag any blue point (A moves the rectangle, B rotates the rectangle). Notice that the rectangle itself never changes since it is completely defined by the length of the two sides and the 90° angles.

• Click on **Reset** to start over.