Question

PLS ANSWER FAST I BEG YOU

Answer 1

ᴅᴏɴ'ᴛ ʙᴇɢ ʏʟʟ, ɪ ᴀᴍ ᴀɴsᴡᴇʀɪɴɢ

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ɢɪᴠᴇɴ :-

diameter = 10 m

radius (r) = 10/2 = 5 m

height (h) = 12 m

length of cloth used to make cone (l) = 1 4/7 = 11/7

Tᴏ ғɪɴᴅ :-

1.) slant height (l)

2.) curved surface area of cone

3.) length of cloth per metre

4.) cost of cloth if rate per metre is Rs. 18

Sᴏʟᴜᴛɪᴏɴ :-

we know that,

l² = r² + h²

l² = (5)² + (12)²

l² = 25 + 144

l² = 169

l = √169

l = 13

slant height is 13 m

curved surface area of a cone = πrl

= 22/7 × 5 × 13

= 143/7 m²

area of cloth used = area of cone

length × breath = 143/7

length × 11/7 = 143/7

length = 13 m

cost of 1 metre cloth = Rs. 18

cost of 13 metre cloth = Rs. 18 × 13

= Rs. 234

Answer 2

Please don't embarrass by saying so. I am here to help.

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Given:-

diameter = 10 m

radius (r) = 10/2 = 5 m

height (h) = 12 m

length of cloth used to make cone (l) = 1 4/7 = 11/7

To Find:-

1. slant height (l)
2. curved surface area of cone
3. length of cloth per metre
4. cost of cloth if rate per metre is Rs. 18

Solution:-

we know that,

l² = r² + h²

l² = (5)² + (12)²

l² = 25 + 144

l² = 169

l = √169

l = 13

slant height is 13 m.

curved surface area of a cone = πrl

= 22/7 × 5 × 13

curved surface area of a cone= 143/7 m²

area of cloth used = area of cone

length × breath = 143/7

length × 11/7 = 143/7

length = 13 m

cost of 1 metre cloth = Rs. 18

cost of 13 metre cloth = Rs. 18 × 13

= Rs. 234

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