A rectangular lawn is 18m long and twice as wide. What is the circumference of this lawn?
Make a square with two rectangles 20 cm long and 10 cm wide. What is the circumference of this square?
Cut out the largest square on a rectangular piece of paper with a length of 24 cm and a width of 16 cm. What's its circumference? What is the circumference of the remaining paper?
A line can just surround a square with a side length of 10 cm. What is the width of a rectangle with a length of 12 cm?
6 A rectangular vegetable field, 9 meters long and 6 meters wide. Fence it up. How long is the fence? If one side is against the wall, how many meters should the fence be at least?
( 1) 84m
(2)54 meters
(3) Classification discussion:
[1] 80cm
[2] 100 cm
(Write down two answers)
(4) The circumference is 64 cm.
The remaining 80 centimeters
(5)8 cm
(6)30 meters
2 1 m or 24 m