Mensurationhard · Past Paper
If the surface area of a sphere is 4πr², and it is cut into four equal parts through the center, find the total surface area of all four parts.
A8πr²
B6πr²
C4πr²
D12πr²
✓ Correct Answer: A — 8πr²
Original area = 4πr². Each part has original curved area/4 = πr² and two semi-circular faces = πr². Total per part = 2πr². Total for 4 parts = 8πr².
Share this question
More from Mensuration
- A river 3m deep and 40m wide is flowing at the rate of 2 km/hr. How much water falls into the sea in a minute?
- If the radius of a circle is 7 cm, what is its area? (Take pi = 22/7)
- Area of a cyclic quadrilateral with sides 3, 3, 4, 4 is:
- The volume of a cylinder is 308 cm³ and its height is 8 cm. Find its base radius. (Use π = 22/7)
- What is the volume of a right circular cylinder if its height is equal to its diameter 'd'?