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Marina CMI [18]
3 years ago
15

What is the internal angle sum of a polygon with 21 sides?

Mathematics
2 answers:
sergij07 [2.7K]3 years ago
6 0
The interior angle of a regular 21-gon is around 162.86∘
Wittaler [7]3 years ago
3 0
162.86 is the answer to this!!
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Help thanksSSSSSSSSSS
Setler79 [48]

Answer:

  • \boxed{\sf{x=24}}

Step-by-step explanation:

<u>GIVEN:
</u>

To find the missing number in the proportion, you have to isolate it the term of x from one side of the equation.

\sf{\dfrac{8}{7}=\dfrac{x}{21}  }

First, thing you do is switch sides.

\sf{\dfrac{x}{21}=\dfrac{8}{7}  }

Multiply by 21 from both sides.

\Longrightarrow: \sf{\dfrac{21x}{21}=\dfrac{8*21}{7} }

Solve.

Multiply the numbers from left to right.

Use the order of operations.

PEMDAS stands for:

  • Parentheses
  • Exponents
  • Multiply
  • Divide
  • Add
  • Subtract

\Longrightarrow: \sf{\dfrac{8*21}{7}=\dfrac{168}{7}=24 }

\Longrightarrow: \boxed{\sf{x=24}}

  • <u>Therefore, the final answer is x=24.</u>

I hope this helps. Let me know if you have any questions.

3 0
2 years ago
Write the equation of a line that is perpendicular to the given line and that passes through the given point. 2x + 4y = –6; (2,
Anna [14]

First we have to find the slope of the given line. We do that by puttiing the equation into slope-interept form. or solving it for y (same thing). 2x + 4y = -6. We move the 2x over by subtraction to get 4y = -2x - 6. Divide both sides by 4 to get the slope-intercept form we are seeking. y=-\frac{1}{2}x-\frac{3}{2}. The slope that is perpendicular to that slope of -1/2 is the opposite reciprocal. Therefore, the perpendicular slope is a positive 2/1 or just 2. If this new line goes through the point (2, 5), it goes through the x value of 2 and the y value of 5. We will use those values along with the slope of 2 to solve for b in our slope-intercept equation. That looks like this: 5=2(2)+b and b = 1. That means our new equation, the one that is perpendicular to the given line, has an equation of y = 2x + 1.

7 0
4 years ago
Help 8th grade math need answers quick
Xelga [282]
Can u give me the options
6 0
3 years ago
PLS HELP ASAP PLSSS IT DETECTS IF ITS RIGHT OR WRONG HELPPP
ipn [44]

Answer:

B

Step-by-step explanation:

7 0
3 years ago
Allyson has a collection of 26 mugs. When packing to move, she put the same number of mugs in each of the first 4 boxes and 2 mu
Grace [21]

Answer:

6 mugs

Step-by-step explanation:

6*4=24

add the remainder 2 to get 26,

since its just asking for the 4 boxes the answer is 6

5 0
3 years ago
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