The students then use two of each tetromino to create two different rectangles. The students are asked to justify that they have found all five possible tetrominoes. ![]() Whole-Class Instruction: Ask the children to identify what shapes they see inside the classroom. Also ask the children how they developed the ideas for their shapes. Ask children to explain the shapes they made and how many tiles they used. Students explore the different tetrominoes that can be made by joining together four squares. Motivation: Give children geometric tiles, and let them make their own shapes. ![]() They are asked to justify that they have found all possible combinations. They are then asked to find all possible shapes that can be made from five triangles. Students first explore combinations of two, three and four triangles. Students explore the different shapes that can be made by joining together a set number of identical equilateral triangles. They also identify what makes a shape regular or irregular. As they create shapes, they develop an understanding of the properties of triangles and quadrilaterals. Students create 2D shapes by joining pins on a circular geoboard. Students would benefit from some experience manipulating two-dimensional shapes. This 5th Grade Geometric Properties of Two-Dimensional Shapes Quiz is common core-aligned to 5.G. Students should be able to use these properties to recognise and name two-dimensional shapes, including non-typical examples of shapes. As the names suggest, a similarity measures how close two distributions are. Various distance/similarity measures are available in the literature to compare two data distributions.
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