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julia-pushkina [17]
3 years ago
15

The regular nonagon has rotational symmetry of which angle measures

Mathematics
1 answer:
Margarita [4]3 years ago
6 0
Rotational symmetry = 360 / # sides
rotational symmetry = 360 / 9
rotational symmetry = 40 degrees


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Answers:

The next two terms are 67.5 and 101.25 in that order.

===========================================

Explanation:

Divide the second term over the first to get 30/20 = 1.5

Divide the third term over the second term to get 45/30 = 1.5

The common ratio is 1.5, which means we multiply 1.5 by each term to get the next term

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fourth term = 1.5*(third term) = 1.5*45 = 67.5

fifth term = 1.5*(fourth term) = 1.5*67.5 = 101.25

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As a shortcut you can plug n = 4 and n = 5 into the function t(n) = 20*(1.5)^(n-1) to get the fourth and fifth terms respectively.

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As isosceles triangle has two congruent sides with a third side 
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<span>A picture would probably help here: </span>


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<span>/ \ ABC = ACB = 39 degrees </span>
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