Circle - practice for 13 year olds - page 4 of 29
Number of problems found: 563
- Wheel
The diameter of the motorcycle wheel is 55 cm. How many times rotates the wheel on the road long 3 km? - Circle removal
The student should remove the inner circle with a radius of 3 cm from the circle with a radius of 7 cm. How much of the area of the large circle will be removed? Express result in percent. - Wire D
A wire of length 6 m is bent to form the perimeter of a semicircle (including the diameter). Determine the radius of the semicircle. - Coin
How many 5-cent coins must be placed in a row so that an identical coin, when rolled along the tops of the coins in the row, completes exactly one full rotation? - Hand velocity ratio
The minute hand is three times longer than the second hand. In what ratio are the magnitudes of the velocities of their endpoints? - Shooting target hits
Members of the shooting circle hit the target 57 times during the shooting, which was 38% of the total number of shots. How many times did they fire in total? - Minute-hand
How long will a large (minute) hand travel on the clock for 48 minutes if its length is 56 cm? - RPM
An electric motor makes 3,000 revolutions per minute. How many degrees does it rotate in one second? - Railway car points
Some points are at rest in a moving railway car concerning the earth's surface. However, some points move in the opposite direction to the direction of the moving car's speed. Which points are they? - Clocks
How long does the track travel the second hand of a clock in 30 hours, which is 4 cm long? - Intersections
How many intersection points do two circles with radii 16 mm and 15 mm have if the distance between their centres is 16 mm? - Wheel peripheral speed
Calculate the peripheral speed of the number on the Wheel of Fortune if the wheel rotates within a period of 0.25 seconds and the number is written 1.5 m from the center of the wheel. - Bicycle Wheel Rotations
How many times does a bicycle wheel with a 100 cm circumference turn on a 24 km long track? - Tree shadow 3
What is the diameter of a tree wrapped in a rope around 3 m 9 dm 7 cm long? How big is its cross-sectional area? - Clock Hands Angle Ten
The hour and minute hands on the clock face make an alpha angle. If you know it's 10 hours and 12 minutes, what is the angle's size? - Wheel diameter
What is the diameter of the wheel when it turns 455 times per 1 km? They rounded to the nearest cm. - Runners circle
Pepa circles the track in 36 seconds. Kamil in 42 seconds. They started together. How many seconds will we meet again at the start? - Clock
What distance will pass the end of an 8 cm long hour hand for 15 minutes? - Clock Tower
What angle is between the hands-on Clock Tower when it shows 17 hours and 35 minutes? - Bicycle wheel
A bicycle wheel has a diameter of 60 cm. Approximately how many times does the wheel rotate on a 2.5 km trip?
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