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The right answer is "A" (35 sq cm)

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This is simpler than it looks.

The area of each triangle is .

The unshaded part is simply the difference between .

It's divided by two because the unshaded area is missing in both triangles.

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Well done!

The trick is to notice the word identical.
Students who fail to take note of it will find this impossible to solve.

Is your child brilliant at Math?

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deleted by author

nice one. haven't seen such problems in the past years. and I don't miss them. :))
and yeah, still smarter than a 12year old. Good to check this occasionally.

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