Practice problems of the area of a circle - page 4 of 17
Number of problems found: 335
- Shape
The plane shape has a maximum area 677 mm². Calculate its perimeter if the perimeter is the smallest possible. - Percentage 67494
A circle with the maximum area was made of a square plate with side a = 85 cm. What percentage of the board is wasted? - Percentage 66714
They cut a full circle from a square plate with a side of 200 mm. What percentage is waste? - Magnification 21383
When we increased the circle's radius by 2 cm, its area increased by 40π cm². Determine the radius of the circle before magnification.
- Circle inscribed
There is a triangle ABC and a circle inscribed in this triangle with a radius of 15. Point T is the point of contact of the inscribed circle with the side BC. What is the area of the triangle ABC if | BT | = 25 a | TC | = 26? - Circles
The areas of the two circles are in the ratio 2:20. The larger circle has a diameter 20. Calculate the radius of the smaller circle. - Percentage 82623
The square in the picture has a side length of 6 cm. What percentage of the content is the colored part? - Circumference 6338
The circle has the same area as the square, whose circumference is 400m. Calculate the diameter of the circle. - Goat
Meadow is a circle with a radius r = 19 m. How long must a rope tie a goat to the pin on the Meadow's perimeter to allow the goat to eat half of the Meadow?
- Logs
The log has a diameter of 30 cm. What largest beam with a rectangular cross-section can carve from it? - Everywhere 36403
We cut out the largest possible round tablecloth from a square fabric of 150x150 cm. After setting, it hung around 20 cm everywhere. What is the area of the round tabletop? - Circumference 6651
Calculate the circumference of a circle if its area is 706.5 cm² - Diameter 6289
A circle with the largest possible diameter is cut from a square with a side length of 35 cm. What percent of the square area is waste? - Cutting square
We cut the circle with the highest possible diameter from a square with a side of 30 cm. How many percents of the square area is this circle?
- Percentage of waste
In a square plate with a side 75 cm, we cut four same circles. Calculate the percentage of waste. - Calculate 6930
Calculate the diameter of a circle whose area S = 78.5 cm². - Radius
Find the radius of the circle with area S = 200 cm². - Circle
How big is an area of a circle if its circumference is 51.2 cm? - Circumference 46181
Calculate the area of a circle that has a circumference of 314 cm.
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