A rectangle has four sides whereas a right angle triangle has only three sides.
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A rectangle has four sides and a right-angle in each of the four corners. A right-angle triangle has three sides and only a right-angle in one corner.
No; because then it would be a triangle.
One is a triangle base...and the other a rectangle..
It is a scalene triangle other than a right angle triangle
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Depends on the shape. A right triangle has one right angle, a rectangle has 4, an equilateral triangle has none, a circle has no angles. There are polygons with more than 4 right angles, and there is no limit on how many, but those with more than 4 are not convex.