What are trapeziums?

Find the characters of a trapezium

Group activity Now make your own trapezium

A quadrilateral with only one pair of parallel opposite sides Fill in the blanks ⑤ ④ ⑥ ③ ① ② Quadrilateral ( ) ①③④⑤⑥ A quadrilateral with one pair of parallel opposite sides （ ） ①④⑤⑥ A quadrilateral with only one pair of parallel opposite sides ( ) trapezium ①④⑤

What’s the difference between the bases and the sides? Say the names of all parts ⑤ upper base lower base ④ upper base lower base side side upper base lower base ① side side side side What’s the difference between the bases and the sides?

upper base lower base From a point on the upper base, we can draw a perpendicular line segment toward the lower base. The perpendicular line segment is the height of this trapezium.

Draw the height of each trapezium： B C D From “B” draw the height h h From“A”draw the height

Which height is right？

Which height is right？

In a trapezium,if there is a right angle, we call it a right angle trapezium.

√ True or false × × 1)There are only two heights in a trapezium. （ ） 2) Upper base must be longer than lower base.（ ） 3)There are two right angles in a right angle trapezium. （ ） √

play： Use scissors to cut the triangle once to make a trapezoid.

play： Use scissors to cut the parallelogram once to make a trapezoid.