A triangle has angle measures of 95° and 65° What is the measure of the third angle
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The third angle is 20°. This is because you add the two angles you have already (95+65) and then you subtract that from 180. In simplier words: If you know 2 angles then you can subtract their sum from 180° to find the measure of the 3rd angle.

Aand b are correctly balanced reactions. they have the same number of atoms in both sides of the reaction