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Elis [28]
3 years ago
15

Find the number of diagonals of a polygon of 13 sides.

Mathematics
2 answers:
aleksley [76]3 years ago
7 0

Answer:

65

Step-by-step explanation:

13(13-3)/2 = 65 diagonals.

Alex17521 [72]3 years ago
7 0
N(n-3)/2 is the number of diagonals. Explain in words why this works. A 13-gon would have 13(13-3)/2 = 65 diagonals.
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Answer:

x = 3

Step-by-step explanation:

We are told that the length of a side of the square is x.

Now, perimeter of square = 4 × side length

Perimeter of square = 4x

Also,we are told that the triangle is equilateral and a side is (x + 1).

Thus, perimeter of triangle = 3(x + 1)

Since we are told that the perimeter of the square is equal to that of the equilateral triangle. Thus;

4x = 3(x + 1)

4x = 3x + 3

Subtract 3x from both sides to get;

4x - 3x = 3

x = 3

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3 years ago
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7 0
3 years ago
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likoan [24]

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6 0
3 years ago
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nikdorinn [45]
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5 0
3 years ago
Jerry charges $15 for each lawn that he cuts. Depending homework and chores, he has time to cut at most 10 lawns a week. Jerry h
vova2212 [387]

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Step-by-step explanation:

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⇒ Option D is correct.



6 0
3 years ago
Read 2 more answers
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