10 August 2011

97. Triangle reduced to 3 square units

Easy Medium Hard Extreme

If the length of 1 matchstick is 1 unit, the area of the triangle is:
= 1/2 X 4 X 3
= 6 square units

Move 4 sticks to reduce the area to 3 square units.

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It should be clear that the area marked "A" is 3 square units, which means the remaining area is also 3 square units.

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