4.G.2
Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles (right, acute, obtuse, straight, reflex). Recognize and categorize triangles based on angles (acute, obtuse, equiangular, and right) and/or sides (scalene, isosceles, and equilateral).
Example Problems
A rectangle has four right angles.
A parallelogram has two pairs of parallel sides.
Is every rectangle also a parallelogram?
A parallelogram has two pairs of parallel sides.
Is every rectangle also a parallelogram?
Triangle ABC has the following vertices:
A
B
C
Is triangle ABC a right triangle?
A
B
C
Is triangle ABC a right triangle?
Triangle ABC has the following vertices:
A
B
C
Is triangle ABC a right triangle?
A
B
C
Is triangle ABC a right triangle?
Khan Academy ResourcesTypes of triangles reviewQuadrilaterals reviewQuadrilateral typesClassify triangles by anglesClassify triangles by both sides and anglesClassify triangles by side lengthsClassify shapes by line and angle typesQuadrilateral propertiesWorked example: Classifying triangles Classifying triangles by anglesClassifying shapes by lines and anglesClassifying triangles Classifying shapes by line and angles types
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