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2 years ago

What is the radius of a semi circle when the area is 20cm

Mathematics

1 answer:

vazorg [7]2 years ago

6 0

hello :
the area of the circle is : 40 cm²
40 = πr²
r² = 40/(3.14 )
r² = 12.73 cm

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Therefore the rate change of distance between the car and the person at the instant, the car is 24 m from the intersection is 12 m/s.

Step-by-step explanation:

Given that,

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(The distance between car and person)²= (The distance of the car from intersection)²+ (The distance of the person from intersection)²+

Assume that the distance of the car from the intersection and from the person be x and y at any time t respectively.

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Since the car driving towards the intersection at 13 m/s.

so, $\frac{dx}{dt}=-13$

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Now

$\therefore \frac{dy}{dt}|_{x=24}=\frac{24}{\sqrt{24^2+100}}.(-13)$

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