A sum just means adding things up.
An angle sum is the sum (in degrees) of the particular angles you are measuring.
Because by definition, there sum will always be zero. Because the definition of opposites are additive inverses.
By definition, they must sum to 90 degrees.
The sum.
By definition, the sum must be unity.
a3 + b3
the average, the sum
Yes, the definition of complementary angles is that their sum is 90 degrees. All 90 degree angles are by definition right angles.
The sum of potential energy + kinetic energy.
Definition Sum of disbursement float and collection float.
A lump sum of money which is owed to someone/a group of people.
Summation means to sum up, or find the total.