Step-by-step explanation:
Let x be the smaller than 4 ×.
To find, the number of times smaller is 2 × than 4 ×
= ?
∴ x =
= 2 × ×
Using the identity,
= 2 ×
Using the identity,
= 2 ×
= 2 × 10
= 20
Thus, the required "option A) 20" is correct.
1. - Cone
2. - Sphere
3. - Cylinder
4. - Pyramid
5. - Prism
Solution:
1.
Lateral surface area of cone =
where r is the radius of the cone and l is the slant height of the cone.
2.
Volume of sphere =
where r is the radius of the sphere.
3.
Total surface area of cylinder =
where r is the radius of the cylinder and h is the height of the cylinder.
4.
Volume of pyramid =
where B is the base area of the pyramid and h is the height of the pyramid.
5.
Lateral surface area of prism =
where p is the perimeter of the base and h is the height of the prism.
