A square has 4 right-angles.
A right-angle triangle has 1 right-angle
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The small squares are indicators that the angles are right angles, which are found in shapes such as rectangles, squares and right-angled triangles. A right angle is 90 degrees, 1 quarter of 360 degrees, a full turn, such as a circle. I hope this helps ^^
Any and all squares and rectangles. Every one of these two shapes has only right angles. Though some triangles also have right angles.
Regular polygons have congruent angles such as squares and equilateral triangles.
Yes they have straight lines no curves and angles.
Triangles can be classified by their sides or their angles. When classifying them by their angles, triangles are called: acute triangles - all three angles are acute (less than 90º) right triangles - one right angle (90º) and two acute angles obtuse triangles - one obtuse angle (larger than 90º) and two acute angles