Please help me solve
2 answers:
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Answer:
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1) 72
cm² / min. ;
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2) 192 cm² / min.
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Explanation:
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Area of a circle: A = r² ;
Rate of change of Area is: da/dt = 2
r (dr/dt) ;
Given: dr/dt = 3 cm / min.
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Problem 1)
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dA/dt = 2 *(12 cm)*(3 cm/ min) = 72 cm² / min. ;
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Problem 2)
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dA/dt = 2 *(32 cm)*(3 cm/ min) = 192 cm² / min.
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1) 72
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2) 192
_______________________________________________
Explanation:
____________________________________________
Area of a circle: A =
Rate of change of Area is: da/dt = 2
Given: dr/dt = 3 cm / min.
______________________________________________________
Problem 1)
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dA/dt = 2
____________________________________________________________
Problem 2)
____________________________________________________________
dA/dt = 2
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As per the problem,
Mathew and his 3 siblings are weeding a flower bed with an area of 9 square yards.
They share the job equally.
We have been asked to find -how many square yards of the flower bed will each child need to weed.
So we will divide the area by the number of people.
Number of square yards of the flower bed will each child need to weed