1. What are trapeziums?

3. Find the characters of a trapezium

4. Group activity
Now make your own trapezium

8. 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

11. 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?

12. 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.

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

14. Which height is right？

15. Which height is right？

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

17. √ 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.
（ ） √

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

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