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The consecutive angles of a parallelogram are
A. equal
B. complementary
C. supplementary
D. none of these.

Answer
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Hint:
We can suppose one figure of the parallelogram and using the properties of the parallelogram can find the sum of the two consecutive angles. If the sum is 90 then they are complementary and if it is 180 then it will be supplementary.

Complete step by step solution:
Here we are told to find the relation between the consecutive angles of the parallelogram. We must know what parallelogram is. It is the quadrilateral in which both the opposite sides are parallel and equal. We need to know what complementary and supplementary means, if the sum of the angles is 90 then the angles are said to be complementary and if the sum of the angels is 180 then they are supplementary.
So we need to find the sum of any two consecutive angles of the parallelogram.
Let us suppose ABCD is a parallelogram and E is the point if we extend the line AB
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Now we need to find the sum of any two consecutive angles say DAB and ABC
Now we know that this is a parallelogram so we can say that ABCD and BCDA
Hence we can say that DAB=CBE (corresponding angles of the two parallel sides are equal)
So we get DAB=CBE (1)
As CBA and CBE lie on the straight line so we know that the sum must be equal to 180
So we can say that
 CBA+CBE=180(2)
Now substituting the value of CBE from equation (1) in equation (2) we get
 CBA+DAB=180
Hence we get the sum of the two consecutive angles to be 180
So they are supplementary.

Hence option C is correct.

Note:
Here we must know what supplementary and complementary angles mean. Properties of all types of quadrilaterals must be the one student must be clear with to solve such types of problems easily.
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