SME
Grade 4 Math · Problem type
Classify angles
Use this for “Is the angle acute, right or obtuse?”
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Is the angle smaller than, equal to, or bigger than a square corner?
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Assumptions
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A right angle is a square corner: 90°.
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An acute angle is smaller than a right angle. An obtuse angle is bigger, but less than a straight line.
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A straight angle is a straight line: 180°.
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Related lessons
Lines, angles, shapes and symmetry
Main lesson
Line symmetry
Use this for “How many lines of symmetry does the shape have?”
Classify triangles and quadrilaterals
Use this to sort triangles and four-sided shapes by right angles and parallel sides.
Lines, line segments and rays
Use this for “Is it a line, a line segment or a ray?”