Advertisements
Advertisements
प्रश्न
In the given figure, the shape of the top of a table is that of a sector of a circle with centre O and ∠AOB = 90°. If AO = OB = 42 cm,· then find the perimeter of the top of the table.
उत्तर
We have
r = 42 cm and θ = 360° - 90° = 270°
Perimeter of the top of the table = Length of the major arc AB + Length of OA + Length of OB
`=theta/360^circxx2pir+42+42`
`=270^circ/360^circxx2xx22/7xx42+84`
`=198 + 84`
= 282 cm
Hence, the perimeter of the top of the table is 282 cm.
APPEARS IN
संबंधित प्रश्न
In Fig. 7, are shown two arcs PAQ and PBQ. Arc PAQ is a part of circle with centre O and radius OP while arc PBQ is a semi-circle drawn on PQ ad diameter with centre M. If OP = PQ = 10 cm show that area of shaded region is `25(sqrt3-pi/6)cm^2`.
Four equal circles, each of radius 5 cm touch each other as shown in fig. Find the area included etween them.
Find the area of the rhombus, the length of whose diagonals are 30 cm and 16 cm. Also, find the perimeter of the rhombus.
PQRS is a diameter of a circle of radius 6 cm. The lengths PQ, QR and RS are equal. Semicircles are drawn with PQ and QS as diameters, as shown in the given figure. If PS = 12 cm, find the perimeter and area of the shaded region.
If the sum of the circumferences of two circles with radii R1 and R2 is equal to the circumference of a circle of radius R, then ______.
The wheel of the car makes 10 revolutions per second. If its diameter is 70 cm, find the speed of the car in km per hour.
Find the volume and the surface area of the spheres in the following :
Radius= 2.1 cm
There are two circular gardens A and B. The circumference of garden A is 1.760 km and the area of garden B is 25 times the area of garden A. Find the circumference of garden B.
Circumference of a circle is always ______.
A dinner plate is in the form of circle. A circular region encloses a beautiful design as shown in the given figure. The inner circumference is 352 mm and outer is 396 mm. Find the width of circular design.
