. Grade 4, Illustrative icon

Are these right?

Illustrative MathematicsVaries

The purpose of this task is for students to measure angles and decide whether the triangles are right or not. Students should already understand concepts of angle measurement and know how to measure angles using a protractor before working on this task. Students should also understand that a defining attribute for a right triangle is that one of the three angles is 90 degrees. The task asks students to choose the appropriate tool which gives them a chance to decide for themselves what they will need to answer the question, thus allowing them to use appropriate tools strategically).

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