Gregory Hunter

Students will need a ruler and protractor to complete this investigation. Students measure the lengths and angle measures given and determine the properties of perpendicular and angle bisectors. For the investigation on the 2nd page (angle bisectors), I suggest showing students that a 90 degree angle can be drawn from the side length to the given points using the edge of a ruler instead of the protractor. This will give them an accurate line through the point and an estimated congruent length.

Supplies Needed: Ruler and Protractor Students will measure the segments and angle measures, and determine the midpoint to draw the midsegment of the triangle. Students will then measure the midsegment length and the angle measures shown to identify the properties of midsegments.

Supplies Needed: Protractor and Ruler This is a good Parallelogram Properties Investigation prior to the written guided notes. Students are using the tools to observe the relationships within parallelograms.

This is a nice investigation for students to determine the rule/formula of the Polygon Angle-Sum Theorem. Student's observe the number of triangles formed after drawing diagonals and determine a relationship between the number of sides and triangles. You can then give them a polygon, such as a pentadecagon, to determine the sum of the angle measures without drawing the figure.