3 years ago

A school day lasts from 9:00am to 3:45

1 answer:

5 0

9:00 to 3:45 = 6 hours 45 min
1 lesson = 55 min
6 lessons = 5 hours 30 min
5.3 + 0.25 = 5 hours 55 min
6.45 - 5.55 = 50 min
lunch = 50 min

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4 years ago

You have two circles, one with radius r and the other with radius R. You wish for the difference in the areas of these two circl

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Answer:

maximum difference of radii = $(r-R)=\frac{1}{2\pi ^{2}}$

Step-by-step explanation:

We know that area of circle is given by

$A=\pi \times (radius)^{2}$

For circle with radius 'r' we have

$A_{1}=\pi \times (r)^{2}$

For circle with radius 'R' we have

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Now according to given condition we have

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$\Rightarrow \pi r^{2}-\pi R^{2}\leq \frac{5}{\pi }\\\\\Rightarrow (r^{2}-R^{2})\leq \frac{5}{\pi ^{2}}\\\\(r+R)(r-R)\leq \frac{5}{\pi ^{2}}\\\\\because (a^{2}-b^{2})=(a+b)(a-b)\\\\(r+R)=10(Given)\\\\\Rightarrow(r-R)\leq \frac{5}{10\pi ^{2}}\\\\\therefore (r-R)\leq\frac{1}{2\pi ^{2}}$