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The two angles sum to 180 degrees. So if one is 78, the other is 102.

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Q: If one side of an angle is 78 what is the other?
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What is measure of the third angle of a triangle if one angle measure 39 and the other angle measure 78?

63 degrees because 180 -39 -78 = 63


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Is an angle of 78 a acute angle?

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