Question

What will it cost to paint the circular roof of building of radius 4.9 m at the rate of Rs.30 per sq m?​

Answer 1

$\huge{ \red { \fbox{answer}}}$

We know,

• Circumference of a circle = pir²

$= > \frac{22}{7} \times 4.9 \times 4.9 \times 30 \\ \\ \\ = > 22 \times 0.7 × 4.9 \times 30 \\ \\ \\ = > 2263.8rupees$

Answer 2

The cost to paint the circular roof of a building is Rs.1386.

ᴛᴏ ғɪɴᴅ:-ᴡʜᴀᴛ ᴡɪʟʟ ɪᴛ ᴄᴏsᴛ ᴛᴏ ᴘᴀɪɴᴛ ᴛʜᴇ ᴄɪʀᴄᴜʟᴀʀ ʀᴏᴏғ ᴏғ ᴀ ʙᴜɪʟᴅɪɴɢ ᴏғ ʀᴀᴅɪᴜs . ᴍ ᴀᴛ ᴛʜᴇ ʀᴀᴛᴇ ᴏғ ʀs. ᴘᴇʀ sǫᴜᴀʀᴇ ᴍᴇᴛʀᴇ ?

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sᴏʟᴜᴛɪᴏɴ :ᴛʜᴇ ʀᴀᴅɪᴜs ᴏғ ᴄɪʀᴄᴜʟᴀʀ ʀᴏᴏғ ɪs r=4.2 m.

$the \: are \: of \: the \: circular \: roof \: is \: A = \pi {r}^{2}$

$A = \frac{22}{7} \times 4. {2}^{2}$

$A = 55.44 {m}^{2}$

The rate of Rs.25 per square metre.

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THE COST OF PAINT REQUIRED IS :-

$C = 55.44 \times 25$

$C = rs.1386$

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ᴛʜᴇʀᴇғᴏʀᴇ, ᴛʜᴇ ᴄᴏsᴛ ᴛᴏ ᴘᴀɪɴᴛ ᴛʜᴇ ᴄɪʀᴄᴜʟᴀʀ ʀᴏᴏғ ᴏғ ᴀ ʙᴜɪʟᴅɪɴɢ ɪs ʀs..

__________sᴏʟᴠᴇᴅ____________