The marks of students out of 25 marks in a class of 30 students are:
21, 23, 20, 19, 22, 20, 15, 18, 10, 17, 8, 19, 24, 10, 25, 21, 19, 16, 16, 22, 18, 10, 15, 8, 6, 28, 22, 20, 21, 24.
How many students have scored more than 50%?
Answers
Answer:
Conceptual understanding / Model Problem / Model Example /
Activities
l Circle : A circle is a closed plane figure whose every point lies at an equal
distance (radius) from a fixed point (center).
l A rubber ball, Globe, tennis ball, shotput are all examples of solids circular in
shape, called spheres.
l Sphere : A sphere is a three dimensional figure, which is made up of all points
in the space, which is at a constant distance from a fixed point. This fixed point
is called centre.
Instructions :
1. Refer page 235 and 237 for understanding the surface area of sphere and
volume of the sphere.
2. Surface area of sphere = 4Sr
2
, Where r is the radius of sphere
Volume of sphere = xSr
3
, Where r is the radius of sphereConceptual understanding / Model Problem / Model Example /
Activities
l Can we call cube and cuboid as right prisms?
l Have you observed cuboid and cube are also right prisms as their lateral faces
are rectangular and perpendicular to base.
l We know volume of cuboid is product of area of base and height = lb×h
Incube = S3
Hence volume of right prism = Area of base × height
l If base is an equilateral trangle then its volume × a2×h where 'a' is side of
triangle.
l Like prism, pyramid is also a solid figure, An example of pyramid is the
Egyptian pyramids, one of the seven wonders of the world.
l Major difference is that the prism has Lateral faces along with top and base.
Whereas pyramid has Lateral faces with base and vertex at top.
Step-by-step explanation:
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