Question
Figure J is a rectangular piece of paper measuring 21 cm by 12 cm. Paul folded the paper along the dotted line to form Figure K. What is the area of the shaded part of the paper?
4 m

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Figure J is a rectangular piece of paper measuring 21 cm by 12 cm. Paul folded the paper along the dotted line to form Figure K. What is the area of the shaded part of the paper?