![]() ![]() Grocery items (food/not food, location in house, regularity of replacement, etc.).Classify other things by their properties.No sides or angles equal (scalene triangles).An angle greater that a right angle (obtuse triangles).Only two sides equal (isosceles triangles).All three sides and angles equal (equilateral triangles).The triangles can be cut out and sorted by properties such as: You start by giving them a 5 x 5 pin geoboard template and ask students to draw as many different triangles as possible. Therefore, a trapezium is not a parallelogram and vice versa. Parallelograms have two pairs of parallel sides, but trapeziums (trapezia) have only one pair. Let’s look at the parallelograms and trapeziums.However, parallelograms need not have right-angled corners so not all parallelograms are rectangles. Is a rectangle a type of parallelogram?Īll rectangles have parallel sides. Let’s look at the rectangles, including the squares. ![]() A rhombus does not need to have four right angles. Students might agree that all the squares are rhombuses because they all have equal sides. Let’s look at the squares and rhombuses (rhombi). They should be exposed to creating Venn diagrams for inclusion relationships, as shown below. However, they should be able to identify if a given shape belongs or does not belong to a class. At this level it is not expected that students can create a complete Venn diagram of all the classes of quadrilateral.
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