#### Answer

360$^{\circ}$

#### Work Step by Step

The sum of the angles within a triangle is 180$^{\circ}$. Since quadrilaterals are made up of two triangles, the sum of the angles within them is 360$^{\circ}$.

Published by
Brooks Cole

ISBN 10:
1439047901

ISBN 13:
978-1-43904-790-3

360$^{\circ}$

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