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) the area of the segment made by this arc.

How much water should be filled in a container 21 cm in height, so that it appears half filled when viewed from the top of the container? (Refractive index of water = 4 3) 8 cm 10.5 cm 12 cm 14 …

It is given that, Radius of a circle = 21 cm. We know that π = 22 / 7, So the circumference of a circle = 2 π r Substituting the values, = 2 ∗ 22 / 7 ∗ 21 So we get, = 2 ∗ 22 ∗ 3 = 132 cm.

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.

The volume of two spheres are in the ratio 64 : 27 . Find the radiii if the sum of the radii is 21 cm.

In a circle of radius 21 cm, an arc subtends an angle of 60o at the center. Find: (i) the length of the arc (ii) area of the sector formed by the arc (iii) Area of the segment formed by the …

Correct option is A. Radio waves Most of the hydrogen gas in the interstellar medium is in cold atomic form or molecular form. Hendrik van de Hulst predicted that the cold atomic hydrogen …

An object is placed 21 cm in front of a concave mirror of radius of curvature 10 cm. A glass slab of thickness 3 cm and refractive index 1.5 is then placed close to the mirror in the space between …

The correct option is A 12 cm Let the water should be filled up to height x, so that bottom of the container should appear to be raised up to height (21−x).

3850 cm 3 Easy Solution Verified by Toppr Correct option is A) Diameter = 21 cm r= 221cm Volume of the sphere= 34πr 3 = 34× 722× 221× 221× 221 =4851cm 3 Was this answer helpful?