Circle - practice for 12 year olds
Number of problems found: 311
- Concentric circles 4
One circle has a radius of 98 cm, and a second concentric circle has a 1m 26 cm radius. How much longer is the circumference of the second circle than that of the first? - Planetary system
Robert has built a mechanical model solar system with three balls representing planets at the end of rods. Each rod is attached to the center, representing the Sun. The planets are lined up when he turns on the motor. The innermost planet makes a revoluti - Pizza diameter
If an 18-inch pizza costs $16.99 and is cut into 12 slices, what is the cost per square inch? - Garden hose
Miguel wound a garden hose around a circular real. If the diameter of the real is 10 inches, how many inches of hose was wound on the first full turn of the real round? The answer to the nearest whole inch, use 3.14 for pi.
- Circular garden 2
What is the area of the circular garden if the diameter of the circular garden is 4 meters? - The minute
The minute hand of a clock is 6 cm long. Find the area it sweeps between 2:05 PM and 2:40 PM. - Circle area
Calculate the circle area with a radius of 1.2 m. - Calculate
Calculate the area of a circle whose radius is 5 dm. - Circle
What is the radius of the circle whose perimeter is 11 km?
- Circle simple
The circumference of a circle is 6.28. What is the area of the circle? - Perimeter to area
Calculate the area of a circle with a perimeter of 15 meters. - Diameter to area
Find the area of a circle whose diameter is 26cm. - Calculate 48493
Calculate the length of the circle if d = 10 cm. - Calculate 2948
Calculate the length of a circle with a diameter of 7 cm.
- Circle - easy 2
The circle has a radius of 6 cm. Calculate its diameter, perimeter, and area: - Increase 4957
How does the area of a circle change if we double its radius? How many times does its area increase? - Bicycle wheel
After driving 157 m, the bicycle wheel rotates 100 times. What is the radius of the wheel in cm? - Cable
The cable consists of 8 strands. Each strand consists of 12 wires with a diameter of d = 0.5 mm. Calculate the cross-section of the cable. - Illuminates 4961
The lamp illuminates a circle with a diameter of 10m. What area does the light illuminate?
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