Advertisements
Advertisements
प्रश्न
A gardener wants to fence a circular garden of diameter 21 m. Find the length of the rope he needs to purchase, if he makes 2 rounds of fence. Also find the costs of the rope, if it cost ₹ 4 per meter. (Take `pi = 22/7`)
Advertisements
उत्तर
d = 21 m
r = `21/2` m
Circumference = 2πr
= `2 xx 22/7 xx 21/2`
= 66 m
Length of rope required for fencing = 2 × 66 m
= 132 m
Cost of 1 m rope = ₹ 4
Cost of 132 m rope = 4 × 132
= ₹ 528
APPEARS IN
संबंधित प्रश्न
The minute hand of a clock is √21 𝑐𝑚 long. Find area described by the minute hand on the face of clock between 7 am and 7:05 am
Choose the correct alternative answer for the following question.
The curved surface area of a cylinder is 440 cm 2 and its radius is 5 cm. Find its height.
Four equal circles are described about the four corners of a square so that each touches two of the others, as shown in the figure. Find the area of the shaded region, if each side of the square measures 14 cm.
Four equal circles, each of radius a units, touch each other. Show that the area between them is `(6/7"a"^2)` sq units.
The circumference of a garden roller is 280 cm. How many revolutions does it make in moving 490 meters?
The sum of the radii of two circles is 10.5 cm and the difference of their circumferences is 13. 2 cm. Find the radii of the two circles.
Find the area and perimeter of the following semicircles: Diameter = 7cm
A wire when bent in the form of a square encloses an area of 484cm2. If the same wire is bent into the form of a circle, find the area of the circle.
Diameters of different circles are given below. Find their circumference (Take π = `22/7`)
d = 70 cm
Ishika has designed a small oval race track for her remote control car. Her design is shown in the figure. What is the total distance around the track? Round your answer to the nearest whole cm.
