By Pythagoras's theorem, to make a right angled triangle,
142 + 152 should be 212
But 142 + 152 = 196 + 225 = 421
whereas
212 = 441
So these three sides cannot make a right angled triangle.
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No, it does not. As far as I'm only in 5th grade advanced class
Surely you know how to find the third side of a right triangle, when you know the lengths of the other two. Find it, and then add up the lengths of the three sides to get the perimeter.
In a right triangle, the side lengths follow Pythagora's Theorem: a^2 + b^2 = c^2; where a and b represent the lengths of the legs and c represents the hypotenuse.
Because the sum of the smaller sides is greater than the largest side and it is possible to construct one right angle triangle with the given lengths
A scalene triangle has three sides of different lengths. A right triangle can be scalene - for instance the '3-4-5' triangle has a right angle opposite the side which is 5 units long.