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What does a right acute triangle look like?
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.
What is a plane triangle?
a plane triangle is a normal triangle, like the isosceles, right angled, equilateral and scalene triangle.
How do you determine that the triangle is a right triangle?
If a triangle has a right angle, it is a right triangle.
How does an irregular triangle look like?
It is a triangle where all no side is equal in length or angle.
What does an isosceles right triangle with legs of 12 units look like?
It will look like one half of a 12 x 12 square cut through diagonally. The hypotenuse angle will be 45 degrees.
