Yes
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No because to form a triangle the sum of its smallest sides must be greater than its longest side.
No. The two shortest sides, 2cm and 4cm, add up to 6cm. 6 cm is shorter than 7cm, so those three sides will not make a triangle.
An iscoceles triangle, because two of the sides are equal but one is not. Please try to pay attention in class, silly. Hope this helps. ☺
a scalene triangle, has no sides or angles the same size
The lengths of the sides of a square if the area is 2cm squared is: 1.414 cm