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A star is formed by extending the sides of regular pentagon as shown in the sketch below.
Note: The outline of the figure is considered the 'star', the angles of the pentagon are not angles of the star.

BCampbell Created for Albert.io. Copyright 2016. All rights reserved

What is the sum of the acute angles of the star?

A

$36^{\circ}$

B

$72^{\circ}$

C

$144^{\circ}$

D

$180^{\circ}$

E

$360^{\circ}$

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