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

Solve:

1)The points (1,5), (4,5), and (1,0) represent three corners of a rectangle; find the coordinates of the fourth point.

2)Seven inches are equivalent to 17.78 cm. F A company just starting business made the following four inventory purchases in June:
June 1 150 units $ 780
June 10 200 units 1,170
June 15 200 units 1,260
June 28 150 u