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Shaded Triangle

Problem

Find the area of the shaded square.


Solution

By splitting the diagram into triangles,

It can be seen that 4/9 of the diagram is shaded. That is, 4/9 × 18 = 8 units2.

What is the perimeter of the shaded square?

Problem ID: 98 (Jan 2003)     Difficulty: 2 Star

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