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3 years ago

Find the perimeter and area: A pentagon has side lengths of 11cm.

Mathematics

2 answers:

LenaWriter [7]3 years ago

4 0

Perimeter: To calculate the perimeter is easy, just multiply 11cm by the number of sides, which in this case, is 5.

So 5 * 11cm = 55cm.

Area: To calculate the area, it's a bit more tricky, the formula is $\frac{1}{4} \sqrt{5(5+2+ \sqrt{5} )} s^{2}$ .

<span>Since it's very hard to do, I got a calculator and did it.

And the answer is: </span> $208.18cm^{2}$ <span>

Hope this helped! c:</span>

hram777 [196]3 years ago

3 0

Let's find the perimeter and area.

Perimeter
A pentagon has 5 sides. Each side is 11 cm. All we need to do is multiply the length of each side by how man sides there are.
5×11=55

So, the perimeter is 55 cm.

Area
It's a very challenging formula for finding the area of a pentagon and there are calculators used for finding the area of shapes like the pentagon and that's what I used.

The area is 208.178 cm²

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Answer:

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Step-by-step explanation:

The bag that contains 6 blue marbles, 3 green marbles, and 1 red marble.

Naveen wants to make sure that drawing a red marble is equally likely as drawing a different color marble, then he could add what?

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Probability of drawing marble of other colour = (9/10)

And we want the the probability of drawing a red marble and one of the other marble to be the same.

This means we have to add a number of red marbles.

Let the number of red marbles to be added be n.

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And the probabilities are equal

(n+1)/(10+n) = 9/(10+n)

n+1 = 9

n = 9 - 1 = 8

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Step-by-step explanation:

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Then we know that the sum of 3 times x and 2 times (x-3) is equal to 19, so we can make the equation

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Answer: D.

Step-by-step explanation:

The associative property of addition states that numbers can be added together regardless of how they are grouped.

Answer A shows a property of multiplication.

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3 years ago

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A forest cover 43,000 acres. A survey finds that 0.2% of the forest is old growth tress. How many acres of old growth trees are

Sveta_85 [38]

Given:

Total forest area = 43,000

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To find:

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Solution:

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2 years ago