Circle - practice for 13 year olds
Number of problems found: 453
- Wheel diameter
A 1m diameter wheel rolled along a 100m long track. How many times did it turn? - Increase 4957
How does the area of a circle change if we double its radius? How many times does its area increase? - Illuminates 4961
The lamp illuminates a circle with a diameter of 10m. What area does the light illuminate? - Irrigates 4958
The water jet for welding the lawn reaches a distance of 1.8 m. How much is the lawn irrigated? - Circumference 8395
The circle's circumference is 321 dm larger than the diameter of the circle. What is the average? - Circumference 6929
Two-thirds of the circumference of the circle is 12π cm long. Calculate the area of the circle. - The ratio
The ratio of the lengths of the two circles is 5:2. Find the ratio of a a) the radii of these circles b) the areas for these circles - Radius
Determine the circle's radius if its perimeter and area are the same numbers. - Circumference - a simple
What is the ratio of the circumference of any circle and its diameter? Write the result as a real number rounded to 2 decimal places. - Describe 5845
The tower clock has a small hand 1 m long. What path will the tip of the little hand describe in 1 day? - Area to perimeter
Calculate the circle circumference if its area is 254.34cm2 - Rotary motion
Find the orbital time, rotational frequency, and angular rate of the second and minute hands on the watch. - Two circles
Two circles with a radius of 4 cm and 3 cm have a center distance of 0.5cm. How many common points have these circles? - Mine
The wheel in the traction tower has a diameter of 4 m. How many meters will perform an elevator cabin if the wheel rotates in the same direction 89 times? - Describe 5105
How many times less would the hour hand per week describe if it was as long as the minute hand? - Circumference 3589
Calculate the circle's radius if the circumference and area are in a 2:5 ratio. - The radius 2
The radius of a circle is increased by 5%. What is the percentage increase in their circumference area? - Intersections
How many intersections have circles with radius 16 mm and 15 mm if the distance of their centers is 16 mm? - Percentage 16423
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? - Baking a cake
Christy is baking a cake that has a 9-inch diameter. She wants to cover the top of the cake with buttercream icing. How much icing will she need?
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