Here are some geogebra applets and screencasts to accompany some of the problems on Exeter pages 3 and 4!

Here is a figure with similar properties to the figure in problem 1 on page 3. What ARE the essential properties of this figure? Construct it!

Page 3, #9. Let P = (a, b), Q = (0, 0), and R = (−b, a), where a and b are positive numbers. Prove that angle PQR is right, by introducing two congruent right triangles into your diagram. Verify that the slope of segment QP is the negative reciprocal of the slope of segment QR.

## Here are some geogebra applets and screencasts to accompany some of the problems on Exeter pages 3 and 4!

Here is a figure with similar properties to the figure in problem 1 on page 3. What ARE the essential properties of this figure? Construct it!

Page 3, #9. Let P = (a, b), Q = (0, 0), and R = (−b, a), where a and b are positive numbers. Prove that angle PQR is right, by introducing two congruent right triangles into your diagram. Verify that the slope of segment QP is the negative reciprocal of the slope of segment QR.brought to you by Livescribe

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