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DanikChar
@DanikChar
August 2021
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За решение двух заданий 50 балов 11-класс
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sedinalana
Verified answer
32
|a+b|=√(a+b)²=√(|a|²+2|a|*|b|*cosa+|b|²)
9+25+30cosa=49
30cosa=15
cosa=0,5
a=60
33
Объем шара равен объему конуса
4/3*π*R³=1/3*πr²h
4R³=r²h
4*16=r²*8
r²=8
r=2√2
Sбок=πrL
L=√(r²+h²)=√(64+8)=√72=6√2
S=π*2√2*6√2=24π
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Answers & Comments
Verified answer
32|a+b|=√(a+b)²=√(|a|²+2|a|*|b|*cosa+|b|²)
9+25+30cosa=49
30cosa=15
cosa=0,5
a=60
33
Объем шара равен объему конуса
4/3*π*R³=1/3*πr²h
4R³=r²h
4*16=r²*8
r²=8
r=2√2
Sбок=πrL
L=√(r²+h²)=√(64+8)=√72=6√2
S=π*2√2*6√2=24π