No, any operation can be done to them.
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Yes
Only when it has 3 unequal acute angles and 3 unequal sides that it is then a scalene triangle.
no it is not scalene has only unequal sides and equilateral only has equal sides
Yes it is only for schools who have ST math website.
No. Only two sides of a trapezium are parallel and they must be unequal in length.