Is the difference between two rational numbers always as rational number?

Yes, the difference of rationals is always a rational.

Consider a/b - c/d, where a, b, c, d are integers with bd≠0.

The difference can be written as

... a/b - c/d = (ad - bc)/(bd)

where each product of integers is also an integer, hence this expression is rational.

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step-by-step explanation:

m∠5 + m∠3 = m∠1   is true.

m∠5 + m∠6 = 180 is true

m∠2 +m∠3 = m∠6   is true

m∠2 +m∠3 +m∠5 = 180   is true