Mensuration

Q2. The circumference of a circle is πr².

Q3. Cone volume=πr²h.

Q4. Sphere volume=4/3πr³.

Q5. Cylinder volume = 2πrh.

Q6. The perimeter of a square is 4 × side.

Q7. கோளத்திற்கு edges இல்லாததால் curved surface area இல்லை.

Q8. If the radius of a circle is doubled, its area becomes four times.

Q9. Area of a rectangle = length × breadth.

Q10. Reshaping a solid without loss changes its volume.