If an angle has been bisected by a ray then it's now 3 angles ( the original 1, and the two created by the ray) this property says you can add the measurements of the two angles together to get the measurement of the original angle
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when you add
Additive inverse of a number a is that number which on addition with a gives 0.7 is additive inverse of -7.The property shown is additive inverse property because the addition yields 0.
additive
The additive identity for a set is a number (denoted by 0) such that a + 0 = 0 + a = a for all elements a which belong to the set.
An element x, of a set S has an additive inverse if there exists an element y, also in S, such that x + y = y + x = 0, the additive identity.