6th grade application questions, rush and hurry!! Bonus points

For clocks, the minute hand goes for an hour is a circle, and the question asks what is the circumference of a circle with the length of the minute hand as the radius (examine the circumference formula) The answer is 2* *20=40 is approximately equal to So the circumference of the circle is centimeters).

The second question: the area swept by the minute hand in half a circle is half the area of the circle made with the radius of the minute hand, and the area of the circle is divided by 2, and this question examines the formula of the circle area The answer is (20*20) 2=628 (square centimeters).

After an hour, we can know that the minute hand has just gone in one circle, so the distance traveled is exactly the circumference of a circle with a radius of 20 cm, i.e. 2 r = 2x20x = 40 (cm), and the scan of the minute hand in half a circle with a radius of 20 cm, i.e. square centimeters).

The tip of the minute hand travels 2 centimeters.

The area scanned by the minute hand in half a revolution = 628 square centimeters.

One circle in 1 hour, that is, a circumference, the distance traveled by the tip of the minute hand is the circumference of the circumference of the circle with a radius of 20 cm, 2 r=

The minute hand goes around once every hour, and half an hour goes half a circle, which is a semicircle.

The radius is the length of the minute hand, which is 20 centimeters.

So the distance = the circumference of the semicircle = pi*r = 20pi centimeters is approximately equal to centimeters.

Distance: ?

Area: 20 (squared) x1 2=?

The method tells you, and the results are calculated for yourself.

Business tax 400*5%=200,000 yuan.

Construction tax 400*6%=240,000 yuan.

400*5%=20 (10,000 yuan).

400*6%=24 (10,000 yuan).

Answer: The shopping mall paid 240,000 yuan and 200,000 yuan respectively for these two taxes in September.

The business tax paid is 400x5%=200,000 yuan, and the construction tax is 20x6%=10,000 yuan.

Now: 50 (1+10%) 1+10%) = RMB.

Read more on the third day than on the first day: 12 + 6 = 18 pages.

The book has: (12+18) (1 2-1 8 3) = 240 pages.

Composite formula: (12+6+12) (1 2-1 8 3) = 240 pages.