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3 years ago

Describe how to find the area of a circle that has only the circumference of the circle?

Mathematics

1 answer:

BlackZzzverrR [31]3 years ago

5 0

Circumference, C = 2 $\pi$ r. Find the radius using this formula then use it to find the area with A = $\pi$ $r^{2}$ .

OR use the formula A = $\frac{C ^{2} }{4\pi }$

Hope it helps. mark as brainliest if it does...

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Brianna has x nickels and y pennies. She has no less than 20 coins worth no more

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Answer:

$y \ge 20 - x$

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Step-by-step explanation:

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Required

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$x\ +\ y\ge 20$

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$y \ge 20 - x$

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Divide through by 0.01

$\frac{0.01y}{0.01} \le \frac{0.80}{0.01} -\frac{ 0.05x}{0.01}$

$y \le \frac{0.80}{0.01} -\frac{ 0.05x}{0.01}$

$y \le 80 -5x$

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$y \ge 20 - x$

$y \le 80 -5x$

The two inequalities are plotted on the graph as shown in the attachment.

$y \ge 20 - x$ --- Blue

$y \ge 80 -5x$ --- Green

Point A on the attachment are possible solutions

At A:

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