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1 year ago

A square has an area of 81 square inches. What is its perimeter?

Mathematics

2 answers:

Rina8888 [55]1 year ago

8 0

Step-by-step explanation:

In order to find the perimeter we need to find the length first ...

...Here, the area is already given ...

Area = 81 inches square

length = ?

Now....

( The formula of area is l × l )

$area = {l}^{2}$

$81 = {l}^{2}$

Now we should find square root of 81...

$l = \sqrt{81}$

$l \: = 9$

Now we find length so it's easy for us to find perimeter...

The formula of perimeter of square is 4l ..

= 4l

= 4 × 9

= 36 inches

hence the answer is 36 inches....

disa [49]1 year ago

7 0

Area of square = $s^2$ where, $s$ is the side length of the square.

$81=s^2$

$9=s$

s must be positive since it is a side length, so the negative root of 81 is rejected.

Perimeter= $4s$

Perimeter= $4(9)=36inches$

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⦁ Use both methods to find the distance between the points on the number line.

Vitek1552 [10]

Answer:

4 and 4

Step-by-step explanation:

Method A

1) Method A: Let 2 be the starting point and -2, the finishing one. Counting between 2 and -2, we can count a distance of 4 units. That's the simplest way, but not convenient to great numbers on the Number Line.

Method B:

There is no such thing as a negative distance, as a physical quantity. So this is the reason why we need to compute the absolute value of two numbers, which is simply what was done on Method B.

|2-(-2)|=|4|=4

As we are dealing with absolute values, the order is not relevant after all, the result remains the same. Take a look:

|-2-2|=|-4|=4

That's why the greater (2) or the lesser number (-2) can be the subtrahend (in bold within the brackets.