Advertisements
Advertisements
प्रश्न
The cost of decorating the circumference of a circular lawn of a house at the rate of ₹ 55 per metre is ₹ 16940. What is the radius of the lawn?
Advertisements
उत्तर
Cost of decorating the circumference = ₹ 16,940
Cost of decorating per meter = ₹ 55
∴ Length of the circumference = `16940/55 "m"` = 308 m
Circumference of the circular lawn = 308 m
2 × πr = 308 m
`2 xx 22/7 xx "r"` = 308 m
r = `(308 xx 7)/(2 xx 22)`
r = 49 m
Radius of the lawn = 49 m
APPEARS IN
संबंधित प्रश्न
In Figure , two concentric circles with centre O, have radii 21cm and 42 cm. If ∠ AOB = 60°, find the area of the shaded region. [use π=22/7]
Find the circumferences of a circle whose radius is 7 cm.
Choose the correct alternative answer for the following question.
The sum of the radii of two circles is 7 cm, and the difference of their circumferences is 8 cm. Find the circumference of the circles.
The wheels of the locomotive of a train are 2.1 m in radius. They make 75 revolutions in one minute.
Find the area and perimeter of the following semi-circle :
Radius= 1.4 cm
The center O of a circle of a radius 1.3 cm is at a distance of 3.8 cm from a given straight line AB. Draw a circle to touch the given straight line AB at a point P so that OP = 4.7 cm and to touch the given circle externally.
The radii of the two circles are 19 cm and 9 cm respectively. The radius of the circle which has a circumference equal to the sum of the circumference of two circles is ____________.
The radius of a circle whose circumference is equal to the sum of the circumferences of the two circles of diameters 36 cm and 20 cm is ______.
A circular pond is 17.5 m is of diameter. It is surrounded by a 2 m wide path. Find the cost of constructing the path at the rate of Rs 25 per m2.
