Q. 15 B

# In the trapezium ABCD, AB || DC and AB = 7 cm and DC = 5 cm. The midpoints of AD and BC are E and F respectively, the length of EF isA. 5 cmB. 7 cmC. 6 cmD. 12 cm

Since AB||DC and E and F are midpoints of AD and BC,

By using the theorem:-

The line segment joining the midpoints of two side of a triangle is parallel to the third side and equal to half of it, we get

AB||CD||EF

Also,

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