1.？ All sides of a cube have () angles.

innumerable

B6

C24

2. Among the following angles, (ABC) is a right angle, (ABC) is an acute angle and (ABC) is an obtuse angle.

3. Look at a corner under a magnifying glass. This angle is compared with the original angle ().

A is getting bigger.

B is getting smaller

C has not changed

4. The figure "Yes (ABCD)" is missing from the small blank rectangular box in the upper right corner of the figure below.

Second, fill in the blanks.

1. There are many corners in the following slide. Please write down the corners in the picture.

? 1 is the angle of (). 2 is () angle.

? 3 is () angle. 4 is () angle.

2. Among the angles we have studied, () angle is less than right angle, and () angle is greater than right angle.

3. There are () corners in the figure below.

4. A Pentagon has () corners.

5. Play 24? 4,6? 7,20? 5,7? 8,25+4,8? 8 These formulas are arranged in descending order of results:

(),(),(),(),(),()。

Third, use it.

1. Miss Wang bought 45 story books, and every five books were wrapped into a package. How many packages are * *? How many bags are left after giving three bags to the first grade?

Column type:

A: * * * I wrapped it and gave it to the first grade. After three bags, there are still several bags left.

2. On New Year's Eve, Lingling and her three sisters packed 36 jiaozi, and each asked for a few on average.

Column type:

A: On average, everyone packs one.

Mom bought 30 meters of cloth, and it takes 12 meters to make a bed sheet. How many meters are left? If it takes 3 meters of cloth to make a suit, how many sets of clothes can be made from the rest of the cloth?

Column type:

A: There is still rice to make a suit.