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Can you think of a reason why the yellow and purple triangles are equal in area ?
If the side length of the yellow triangle is taken as the unit for length, what length is the third side of the purple isosceles triangles ?
The Square Hole
Age 14 to 16
Challenge Level 
Can you think of a reason why the yellow and purple triangles are equal in area ?
If the side length of the yellow triangle is taken as the unit for length, what length is the third side of the purple isosceles triangles ?
