If the lengths of the sides AB, BC and C...

If the lengths of the sides AB, BC and CA of a triangle ABC are 10 cm, 8 cm and 6 cm respectively and if M is the mid-point of BC and MN || AB to cut AC at N, then the area of the trapezium ABMN is equal to

(a) 18 sq. cm

(b) 20 sq. cm

(d) 16 sq. cm

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