No, it is not.
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It will be a right angled triangle with angles of 90, 72 and 18 degrees.
No, a triangle can have up to one right angle, but it doesn't have to be a right angle in order to be a triangle. A right triangle had one right angle. so, NO
square has 4 right angles and triangle has no right angles
Find the perimeter of a right triangle with legs measuring 3 and 4
No