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Question

Construct a trapezium ABCD in which AB = 6 cm, BC = 4 cm, CD = 3.2 cm, ∠B = 75° and DC || AB.

A
Trapezium cannot be constructed.
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B
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C
It is mandatory to give one more measurement.
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D
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Solution

The correct option is B
Given, DC || AB.
Hence,
ABC+BCD=180 (Co-interior angles)
75°+BCD=180°
BCD=180°75°=105°
BCD=105°.

Steps of Construction:

1. Draw a line segment AB of length 6cm.
2. Construct an angle of 75° at the point B and extend the line.
3. Keeping B as the centre, cut an arc of radius 4cm on the extended line. Mark the point to be C.
4. Construct 105° at the point C and extend the lines.
5. Keeping C as the centre, cut an arc of radius 3.2cm on the extended line. Mark the point to be D.
6. Join D to A and C and C to B.

Trapezium ABCD is hence constructed.


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