Question
HJK and JKL are two identical equilateral triangles. HJ = JM and LK = KN.  Given that HL = 42 cm and MN = 72 cm, find the total unshaded areas.
3 m

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HJK and JKL are two identical equilateral triangles. HJ = JM and LK = KN.  Given that HL = 42 cm and MN = 72 cm, find the total unshaded areas.