# The area of circle problems

#### Number of problems found: 150

• Circle area
Calculate the circle area with a radius of 1.2 m.
• Circle simple
Circumference of a circle is 6.28. What is the area of the circle?
• Circle - simple
Calculate the area of a circle in dm2, if its circumference is 31.4 cm.
• Squaring the Circle
Calculating side of the square with the same area as the circle of radius 18.
• Perimeter to area
Calculate the area of a circle with the perimeter 15 meters.
• Diameter to area
Find the area of a circle whose diameter is 26cm.
• Circles
Area of circle inscribed in a square is 14. What is the area of a circle circumscribed around a square?
• Circular flowerbed
Circular flowerbed with diameter 8 m we split by concentric circle to circle and annulus with the same area. Find the radius of the circle.
• Area to perimeter
Calculate circle circumference if its area is 254.34cm2
• Calculate
Calculate the area of a circle whose radius is 5 dm.
• Inscribed circle
The circle inscribed in a triangle has a radius 3 cm. Express the area of the triangle using a, b, c.
• Circle
How big is area of circle if its circumference is 80.6 cm?
• Circular ring
Square with area 16 centimeters square are inscribed circle k1 and described circle k2. Calculate the area of circular ring, which circles k1, k2 form.
• Concentric circles
There is given a circle K with a radius r = 8 cm. How large must a radius have a smaller concentric circle that divides the circle K into two parts with the same area?
• Two annuluses
The area of the annular circle formed by two circles with a common center is 100 cm2. The radius of the outer circle is equal to twice the radius of the inner circle. Determine the outside circle radius in centimeters.
• Equilateral triangle vs circle
Find the area of an equilateral triangle inscribed in a circle of radius r = 9 cm. What percentage of the circle area does it occupy?
• Inscribed rectangle
The circle area is 216. Determine the area of inscribed rectangle with one side 5 long.
• Circle and rectangle
A rectangle with sides of 11.7 cm and 175 mm is described by circle. What is its length? Calculate the content area of the circle described by this circle.
• Circle inscribed
Calculate the perimeter and area of a circle inscribed in a triangle measuring 3 , 4 and 5 cm.
• Circle in rhombus
In the rhombus is an inscribed circle. Contact points of touch divide the sides to parts of length 19 cm and 6 cm. Calculate the circle area.

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Examples of area of plane shapes. Circle Problems.