Question

7. Iғ ᴛʜᴇ ᴅɪᴀᴍᴇᴛᴇʀ ᴏғ ᴀ ᴄɪʀᴄʟᴇ ɪs ɪɴᴄʀᴇᴀsᴇᴅ ʙʏ
100%. Iᴛ's ᴀʀᴇᴀ ɪs ɪɴᴄʀᴇᴀsᴇᴅ ʙʏ
1) 100%
2) 200%
3) 300%
4) 400%
ᴀʙᴇʏ ᴀ ᴠʜɪ ᴋᴀʀ ʀᴀʜɪ ʜᴜ sᴇᴀʀᴄʜ ᴋᴀʀ ʀᴀʜɪ ʜᴜ ᴛᴇʀᴇ ʟɪʏᴇ ​

Answer 1

Answer:

400%

Explanation:

If something is increased by 100%, it is actually doubled.

Area of a circle, A = πD²/4

Since D is doubled, D² is quadrupled (4 times) and so, A is quadrupled as well, that is, a 400% increase in Area.

New area corresponding to the doubled diameter,

A' = π (2D)²/4 = 4 × πD²/4 = 4 × A

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