Primary Mathematics Challenge - 2022 - 10 | Exact Science

10

In the figure below, the triangles are all equilateral. The dotted line is 12 cm long. How long in total is the zigzag line?

A. 12 cm

B. 16 cm

C. 18 cm

D. 24 cm

E. 28 cm

Answer

D. 24 cm

‍

SOLUTIOn

In each triangle, the length of the two full lines adds up to twice the length of the dotted side of the triangle. The dotted line is 12 cm long so the sum of the lengths of the full lines is 24 cm.

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