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shusha [124]
3 years ago
12

For which polygon is the sum of the interior angles equal to 720? A: quadrilateral B: pentagon C: hexagon D: septagon

Mathematics
1 answer:
ICE Princess25 [194]3 years ago
8 0

Answer:

C. Hexagons

Step-by-step explanation:

It has a 720 degrees.

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What is the area of a circle whose equation is (x-3)² + (y + 1) ² =81?
kupik [55]
Okay, first, given the equation, we need to find out what the radius of the circle is. Let us state the general equation of a circle: 

\frac{(x-x_{1})^2}{r^2}+ \frac{(y-y_{1})_^2}{r^2}=1

Where (x_{1}, y_{1}) is the centre of the circle. In this case, we don't need to know the centre. Just the radius. 

Let us start by converting the equation into standard for, which I typed above. Divide both sides by 81. 

\frac{(x-3)^2}{81}+ \frac{(y+1)^2}{81}=1

Great! We now know the radius of the circle. It is \sqrt{81} because it is the bottom fraction. Now we know that the radius is 9. 

So now lets input this into the area of circle formula: 

A=πr^2 

Now we insert our radius. 

A=9^2π 

=A=81π 

You can convert that into a decimal if you wish. 

Hope this helped!

~Cam943, Moderator
4 0
3 years ago
On a map, San Francisco is 7.5 inches from San Diego. The actual distance is 500 miles. The same map shows that Fresno is 3.3 in
Strike441 [17]
If 500 miles is represented by 7.5 inches:
Divide 500 by 7.5 
500/7.5 = 66.666
Multiply this by 3.3
66.666*3.3 = 220

The answer is 220 miles
6 0
3 years ago
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Does anyone knows this please!<br><br> -2x x 5x<br> -(8x)^2
satela [25.4K]

Answer:

-74x^2

Step-by-step explanation:

-2x x 5x -(8x)^2

-10x^2-(8x)^2

-10x^2-64x^2

-74x^2

7 0
3 years ago
Which decimal is the greatest?
tankabanditka [31]
3.2591 is the greatest
5 0
3 years ago
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A gold mine has two elevators, one for equipment and another for miners. The equipment elevator descends 6 feet per second. The
oksano4ka [1.4K]

Answer:

It should the miners

Step-by-step explanation:

Miners:

17(time) x 16 (feet per second) =  272(distance)

equipment

22 (time) x 6 (feet per second)= 132 (distance)

8 0
3 years ago
Read 2 more answers
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