Lesson: Lines and Angles of 2D Shapes Mathematics • 3rd Grade
In this lesson, we will learn how to describe polygons by considering whether they have acute, obtuse, or right angles and the number of pairs of parallel or perpendicular sides they have.
Look at this rectangle and answer the questions.
True or False: It contains two pairs of parallel lines.
True or False: It contains one pair of perpendicular lines.
Take a look at this shape then answer the questions.
How many angles does it have?
How many obtuse angles does it have?
The given quadrilateral contains two angles.