Draw a capital "L." Connect the two ends with a straight line.
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Such a triangle would presumably have one right angle, and two acute angles. A right angle has a measure of 90 degrees; an acute angle has a measure of less than 90 degrees. Since both of the other two angles in a right triangle must be acute angles, you'd think at first that every right triangle must be a right acute triangle. But when you go and look up the definition of an "acute triangle", it turns out to be a triangle in which all three angles are acute. So the fact is that there's no such thing as a right acute triangle, because the 90-degree angle in a right triangle is not acute.
a plane triangle is a normal triangle, like the isosceles, right angled, equilateral and scalene triangle.
If a triangle has a right angle, it is a right triangle.
It is a triangle where all no side is equal in length or angle.
It will look like one half of a 12 x 12 square cut through diagonally. The hypotenuse angle will be 45 degrees.