Circle - practice for 13 year olds - page 3 of 29
Number of problems found: 563
- Compass
What is the angle between compass directions J (Juh) and ZSZ (ZápadoSeveroZápad)? - Mine
The wheel in a mine hoist has a diameter of 4 m. How many metres does the elevator cabin travel if the wheel rotates 89 times in the same direction? - Circle diameter ratio
You know the ratio of the circumference of the circle to the area is 4:9. What is the circle's diameter? - Oval track length
Calculate the length of the oval race track, which has two straights of 100 m, and the diameter of the curves is 52 m. - Area to perimeter
Calculate the circle circumference if its area is 254.34 cm2 - Clock hands
How many times less would the hour hand per week describe if it was as long as the minute hand? - Circle radius
Calculate the circle's radius if the circumference and area are in a 2:5 ratio. - Wheel
What is the wheel diameter if the 0.57 km track turns 106 times? - Circumference - a simple
What is the ratio of the circumference of any circle to its diameter? Write the result as a real number rounded to 2 decimal places. - Clocks The length of the minute hand is 12 cm. What track in meters will its endpoint describe in a week?
- Rotary motion
Find the orbital time, rotational frequency, and angular rate of the second and minute hands on the watch. - Pizza percentage remaining
The pizza has the shape of a circle and is divided into eight equal parts. My mother ate three parts. What percentage of pizza is left? - The spinner
The spinner below is spun 12 times. It landed on I 4 times, II 7 times, and III 1 time. What is the difference between the experimental and theoretical probabilities of landing on the II? - Well
A rope with a bucket is fixed on the shaft with the wheel. The shaft has a diameter of 45 cm. How many meters will drop bucket when the wheels turn 7 times? - Silo
The outer perimeter of the silo is 10 m. The concrete wall is 13 cm thick. What is the diameter and area of the inside floor of the silo? - Wheel circumference
The circumference of the first wheel is 0.5 m larger than the circumference of the second wheel. The first wheel turns on the 36 m track as many times as the second on the 30 m track. Determine the rims of both wheels. - Bicycle wheel
What is the diameter in centimeters of the wheel of a bicycle if it turns 2000 times on a track 4082 m long - Merry-go-round angular velocity
Calculate the magnitude of the angular velocity of the seat of a merry-go-round moving in uniform motion in a circle with an orbital period of 0.2 minutes. - Clock hand angle
What is the angle of the clock hands: a / at 16 hours 15 minutes b / v 8 hours and 4 minutes - Two gears
The two gears fit together. The larger gear has 32 teeth. The smaller gear has 20 teeth fewer. How many times does turn a smaller gear if the bigger gear turns three times?
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