No
No, it cannot. By definition, all 3 angles in a triangle must add up to 180 degrees. If you have two right angles, that's 180 already (90 + 90) with no way for there to be a third angle in the shape.
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There are no obtuse angles in a right triangle. A right triangle consists of one right angle and two acute angles.
An obtuse triangle can have no right angles, and has two equal angles.
It is impossible to have a triangle with two right angles. This is because a triangle=180 degrees. Two right angles would make up all of the 180 degrees.
No, because two right angles=180 degrees. A triangle has three sides and is 180 degrees, so two right angles would not form a triangle.
If a triangle is an isosceles triangle as well as being a right-angled triangle, the size of the two angles (that are not right angles) are 45 degrees.