exam Maths Puzzle Numerical Ability

given:angle4 is an exterior angle of the triangle
Proves:m angle 4= angle 1+ angle 2

m angle 3+ m angle 4=180??

those that is Definition Supplementary angles???

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exam Other Question

On the blackboard ,the mathematics professor wrote a polynomial f(x) with integer coefficients and said"today is my son's birthday.when his age A is substituted for x,then f(a)=A,Y Solve for the unknown: 8/52 = m/39
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Is the rate 1.2 inches of rain/5hours equivalent to the rate 2.1 inches of rain/8hours?