The figure below is not drawn to scale. ABEF is a parallelogram and BCDE is a trapezium. BE//CD, AB//FD and BC//AD. DF is a straight line. and .

- (a)
Find .
Answer: ___
- (b)
Find .
Answer: ___
- (c)
Find .
Answer: ___
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Worked solution
8(a)
1. Find the angle corresponding to $\angle DAF$ on the line $BE$.
Let intersect at a point . Since is a parallelogram, .
Using as a transversal, the corresponding angle .
2. Find $\angle CBE$ using the parallel lines $BC$ and $AD$.
We are given that . Using as a transversal, the corresponding angle .
3. Calculate $\angle BCD$ using the interior angles of the trapezium.
In trapezium , we are given .
Interior angles between parallel lines sum to , so:
8(b)
1. Find $\angle AFD$ using the sum of angles in $\triangle ADF$.
In ,
(angle sum of triangle)
2. Find $\angle ABE$ using parallel lines.
Since , the interior angles and are supplementary:
Since is a parallelogram, . The interior angles and are supplementary:
(Alternatively, directly since both are supplementary to )
8(c)
1. Find $\angle AFD$ using the angle sum of $\triangle ADF$.
In ,
2. Find $\angle BAF$ using the parallel lines $AB$ and $FD$.
Since , the interior angles are supplementary:
3. Find $\angle BEF$ using the properties of parallelogram $ABEF$.
In parallelogram , opposite angles are equal:
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