Advertisements
Advertisements
प्रश्न
The diameter of a sphere is 6 cm, Find the total surface area of the sphere. (π = 3.14)
उत्तर
Diameter of sphere = d = 6 cm
Radius = r = d/2 = 6/2 = 3 cm
the total surface area of sphere = 4πr2
= 4×3.14×32
= 4×3.14×9
= 36×3.14
= 113.04 cm2
Therefore the total surface area of sphere = 113.04 cm2
APPEARS IN
संबंधित प्रश्न
An umbrella has 8 ribs which are equally spaced. Assuming umbrella to be a flat circle of radius 45 cm. Find the area between the two consecutive ribs of the umbrella.
In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. Find:
(i) The length of the arc
(ii) Area of the sector formed by the arc
(iii) Area of the segment forced by the corresponding chord
[use Π = 22/7]
A chord of a circle of radius 12 cm subtends an angle of 120° at the centre. Find the area of the corresponding segment of the circle. [Use π = 3.14 and `sqrt3 = 1.73` ]
To warn ships for underwater rocks, a lighthouse spreads a red coloured light over a sector of angle 80° to a distance of 16.5 km. Find the area of the sea over which the ships warned. [Use π = 3.14]
ABC is a triangle with AB = 10 cm, BC = 8 cm and AC = 6 cm (not drawn to scale). Three circles are drawn touching each other with the vertices as their centres. Find the radii of the three circles.
The area of sector of circle of radius 2cm is 𝜋cm2. Find the angle contained by the sector.
The area of sector of circle of radius 5cm is 5𝜋 cm2. Find the angle contained by the sector.
The perimeter of certain sector of circle of radius 5.6 m is 27.2 m. Find the area of sector.
In the given figure, O is the centre of the circle. m ( arc PQR) = 60° OP = 10 cm. Find the area of the shaded region.( \[\pi\]= 3.14, \[\sqrt{3}\]= 1.73)
In the given figure, if O is the center of the circle, PQ is a chord. \[\angle\] POQ = 90°, area of the shaded region is 114 cm2, find the radius of the circle. \[\pi\] = 3.14)
In the given figure, three sectors of a circle of radius 7 cm, making angles of 60°, 80° and 40° at the centre are shaded. Find the area of the shaded region.
Four cows are tethered at the four corners of a square field of side 50 m such that the each can graze the maximum unshared area. What area will be left ungrazed?
If `theta` is the angle in degrees of a sector of a circle of radius V, then area of the sector is ____________.
Find the area of the shaded region where ABC is a quadrant of radius 5cm and a semicircle is drawn with BC as diameter.
The area of the shaded portion in the following figure is equal to the area of.
The circumference of a circle is 100 cm. The side of a square inscribed in the circle is ______.
Find the area of the segment of a circle of radius 12 cm whose corresponding sector has a central angle of 60° (Use π = 3.14).
In figure, ABCD is a trapezium with AB || DC, AB = 18 cm, DC = 32 cm and distance between AB and DC = 14 cm. If arcs of equal radii 7 cm with centres A, B, C and D have been drawn, then find the area of the shaded region of the figure.
The central angles of two sectors of circles of radii 7 cm and 21 cm are respectively 120° and 40°. Find the areas of the two sectors as well as the lengths of the corresponding arcs. What do you observe?
