In triangle abc, ab = 6 cm and ac = 3cm. if m is the midpoint of ab and a straight line through m parallel to bc cuts ac in n, what is the length of an?

the answer is the length of an is = 18

square pyramid

step-by-step explanation:

square prism looks like nothing like that

triangular prism has a rectangular base instead of a square base

tetrahedron has a triangular base

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step-by-step explanation: