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This is a Area question.

In Primary school Area, we need to cut and paste.

Cut ABE and ADF. Paste together, you get half square area.

Triangle EFC is 1/8 of the square.

So 1/2 + 1/8 = 5/8 unshaded

1 – 5/8 = 3/8 shaded.

3/8 × 72 = 27 cm^2

 

Don’t try to use formula.

Primary school teacher only teach area of square, triangle, circle.

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