Content Area: Math

 

Index: 4.2A Grade 5 CPI 2

 

Standard: 4.2 - Geometry and Measurement

 

Strand: A - Geometric Properties

 

Cumulative Progress Indicator: 2 - The student will identify, describe, compare, and classify polygons.

·        Triangles by angles and sides

·        Quadrilaterals, including squares, rectangles, parallelograms, trapezoids, rhombi

·        Polygons by number of sides

·        Equilateral, equiangular, regular

·        All points equidistant from a given point form a circle

 

Grade: 5

 

Sample Activities:

 

·        Students trace a figure onto several transparencies; figures such as squares, rectangles, parallelograms, rhombuses, trapezoids, kites, and arrowheads can be used. Then they draw the lines of symmetry for the figure. They rotate, translate, and flip the transparencies and compare them to an original transparency to investigate such properties as: the number of congruent sides in the figure, the number of parallel sides in the figure, whether the diagonals are congruent, whether the diagonals bisect each other, whether the diagonals are perpendicular, and whether the figure has half-turn symmetry (180 degrees). They write about their findings and explain their reasoning.

 

·        Students use Logo to investigate the sum of the measures of the exterior angles of any polygon (360 degrees) and the angle measure of each exterior angle of a regular polygon.

 

·        Students select straws cut to five different lengths (for example, from one inch to five inches) and form as many different triangles as they can, recording the results. They sort the triangles into groups with 0, 2, or 3 equal sides and label the groups as scalene, isosceles, and equilateral triangles.

 

·        Link to Additional Framework Activities