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Mathematics, Grade 3 Core Standard: 3.3 Geometry and Measurement Describe and analyze properties of two-dimensional shapes, including perimeters. Score Reporting Category 3 It is essential that these standards be addressed in contexts that promote problem solving, reasoning, communication, making connections, and designing and analyzing representations. Content Standard: Boundaries of Assessable Content: 3.3.2 Identify, describe, compare, analyze, and informally classify triangles by their sides and angles. Assessable Academic Vocabulary: acute angle congruent degrees equiangular equilateral isosceles legs obtuse angle right angle right triangle scalene side triangle (triangular) vertex (vertices) Items assessing this standard require students to classify triangles informally by their sides and angles. Students will identify the number of congruent sides in a triangle, and will use the words scalene, isosceles, or equilateral to describe a triangle. (Students should know that an equilateral triangle is also an isosceles triangle.) Items will ask students to identify a drawn triangle from its written description, describe a triangle from a drawing, compare triangles, analyze a triangle or a description of a triangle (e.g., is it possible to have a right triangle with three congruent sides?), and classify a triangle based on its drawing. Symbols and Notation: Content Connections from Previous Grades: congruency marks for sides: 1.3 Sample Items: Which two triangles have the same shape? (A question about the number of angles and/or sides in a triangle.) (Which is not a triangle? Include pictures of triangles and then one with curved legs like this.) right angle Mathematics Test Specifications and Test Blueprints 21 Oregon Department of Education Office of Assessment and Information Services