Exercises: Classifying Two-Dimensional Figures by Lines and Angles
Work through each section in order. Use the paper-corner test (or a right-angle template)
to check angles instead of guessing by eye.
Recall / Warm-Up
These problems review vocabulary from 4.G.A.1.
Which pair of lines never meet, no matter how far they are extended?
Perpendicular lines
Parallel lines
Intersecting lines
Right-angle lines
What is the relationship between the two lines shown?
Perpendicular
Parallel
Neither
Which of these shapes has exactly 3 sides?
Triangle
Rectangle
Pentagon
Hexagon
Fluency Practice
How many pairs of parallel sides does the parallelogram shown have?
How many pairs of parallel sides does the trapezoid shown have?
How many pairs of parallel sides does the scalene triangle shown have?
Which best describes the sides of the rectangle shown?
Every pair of adjacent sides is perpendicular
No sides are perpendicular
It cannot be determined from the figure
What type of triangle is shown, based on its angles?
Acute triangle
Right triangle
Obtuse triangle
What type of triangle is shown, based on its angles?
Acute triangle
Right triangle
Obtuse triangle
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