it measures the right angled way of a square or any other shapes (90 degrees )
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Triangles are rigid, quadrilaterals are not - a square can be "squashed" into rhombus.
The square root of negative 18 is an imaginary number.The square root of positive 18 is [ 3 sqrt(2) ].If the 18 is negative, then scientists and engineers indicate its square root as 3i sqrt(2) . The little ' i ' indicates the square root of negative one.
Because if it were called a triangle while shaped like a square, people would laugh, and we Engineers already have enough credibility problems with clients. The same rationale applies to the musical percussion instrument.
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There are no such things as thirty polygons, but I can try to help you name thrity: square square square square square square square square square square square square square square square square square square square square square square square square square square square square square square. You are welcome.