Can someone help me to solve this?
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Hello
oh sorry
Step-by-step explanation:
ye meri book se nhi h .
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Step-by-step explanation:
[80(18-r)+80(18+r)]/(18²-r²) =22.5
(1440-80r +1440+80r)/(324-r²)=22.5
2880=22.5(324-r²)
2880=7290-22.5r²
22.5r²=7290-2880
22.5r²=4410
r²=4410/22.5
r=√196=14
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