Yes. A right triangle is a triangle that has one 90 degree side. All angles of a triangle have to add up to 180 degrees.
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A rectangle has 4 angles each of 90 degrees.
By definitions: two levels of them. If it is has a right angle, it must be 90 degrees. If it is a rectangle it must have right angles, otherwise it is not a rectangle.
Yes and the diameter of the circle will be the diagonal of the rectangle.
All 4 corners of a rectangle are 90 degree angles. If they aren't, then it's not a rectangle.
A right-angle is a 90 degree angleA right triangle has one, and a 90-degree angle isone.