In triangle ABC, D and E are the midpoints of AB and AC respectively and DE= 5.6 cm. Find the length of BC.
Fig below

Dear Student,
Solution:
Here, DEBC so, DE=12×BC {Because mid point theorem states that The line segment in a triangle joining the midpoint of two sides of the triangle is said to be parallel to its third side and is also half of the length of the third side.}BC=2×DE=2×5.6=11.2cm
Regards

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