# Circle - problems

- Tangents

To circle with a radius of 98 dm from the point A guided two tangents. The distance of both points of contact is 155 dm. Calculate the distance from point A and circle centre. - Roller

Cylinder shell has the same content as one of its base. Cylinder height is 25 m. What is the radius of the base of the cylinder? - Cut and cone

Calculate the volume of the rotation cone which lateral surface is circle arc with radius 14 cm and central angle 66 degrees. - EQL triangle

Calculate inradius and circumradius of equilateral triangle with side a=100 cm. - Nine-gon

Calculate the perimeter of a regular nonagon (9-gon) inscribed in a circle with a radius 20 cm. - Coin

How many 20-cent coins must be put in a row that next 20-cent coins after them (above) rolled on it axis? - Tree trunk

Calculate the average tree trunk with a circumference of 151 cm. - Field with vegetables

Field planted with vegetables has shape of a rectangular isosceles triangle with leg length of 24 m. At the vertices of the triangle are positioned rotating sprinklers with a range of 12 m. How much of the field sprinkler doesn't irrigated? - Meridian

What is the distance (length) the Earth's meridian 27° when the radius of the Earth is 6370 km? - Rotary cylinder

The rotating cylinder has a surface area 69.08 cm^{2.}The area of the shell is 62.8 cm^{2.}What is the diameter of the cylinder? - Round table

Round table with diameter d = 95 cm is coated by square tablecloth with a side length 122 cm. About how many cm is higher center of tablecloth than its cornes? - Percentage of waste

In a square plate with side 42 cm we cut 4 same circles. Calculate the percentage of waste. - Semicircle

To a semicircle with diameter 10 cm inscribe square. What is the length of square sides? - 6-gon

Perimeter of regular hexagon is 41. Calculate its circumradius (radius of circumscribed circle). - CD disc

A compact disc has a diameter of 11.8 cm. What is the surface area of the disc in square centimeters? - Wheel

Diameter of motocycle wheel is 63 cm. How many times rotates wheel on roand long 1 km? - 22/7 circle

Calculate approximately area of a circle with radius 20 cm. When calculating π use 22/7. - Quarter circular

The wire that is hooked around the perimeter of quarter-circular arc has length 14π+56. Determine the radius of circle arc. - Plastic pipe

Calculate weight of the plastic pipe with diameter d = 60 mm and length 400 cm if the wall thickness is 6 mm and the density of plastic is 1228 kg/m^{3.} - Radius

Determine the radius of the circle, if its perimeter and area is the same number.

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