![]() ![]() Students explore the sum of exterior angles for several polygons and speculate about the results. Students also explore the effect diagonals have on interior angles. The sides of a parallelogram are extended beyond the vertices, and students explore which angles are congruent and which are supplementary. Students explore three intersecting lines and the combinations of angles. How many right angles can a trapezoid have? How many congruent angles or congruent sides can it have? Can its diagonals be perpendicular or congruent? Students investigate possible trapezoids. If the diagonals are perpendicular, is the figure a rhombus? Students further investigate diagonals in quadrilaterals. Students also look at possible parallelograms with two sides given and possible rhombuses with four sides given. Students investigate the possible quadrilaterals that can be made from any four given side lengths, focusing on those that can’t make a quadrilateral. Building the cube helps students see the transition from two-dimensional shapes and their relationship to three-dimensional figures. Students have a chance to review angle measurements in a parallelogram. You can then use this time to provide additional help to students who need review of the unit’s concepts or to assist students who may have fallen behind on work. ![]() ![]() Allow students who have a clear understanding of the content thus far in the unit to work on Gallery problems of their choosing. ![]()
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