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I assume that we are talking about a "right angled triangle". Guessing the angled bit gets missed in US English.
It means that the Triangle contains a right angle which is to say one of 90 degrees.
A square corner in other words. As to why a right angle is so called wikipedia says:
The term is a calque of Latin angulus rectus; here rectus means "upright", referring to the vertical perpendicular to a horizontal base line.
What else can I help you with?
What does a triangle with a square inside mean?
It means that it is a right angle triangle
What does right triangle mean in math?
A triangle with a 90 degree angle.
What kind of triangle has the measure 45 45 and 90?
If you mean angles then it is a right angle triangle or an isosceles right angle triangle
What type of triangle so stopredicular lines?
If you mean what type of triangle has perpendicular lines then it is right angle triangle.
What does a right triangle birthmark on the left leg mean?
It does not mean anything in particular.
What does a triangle with a square inside mean?
It means that it is a right angle triangle
What does right triangle mean in math?
A triangle with a 90 degree angle.
What kind of triangle has the measure 45 45 and 90?
If you mean angles then it is a right angle triangle or an isosceles right angle triangle
What side is the hypotenuse in a right triangle?
I am guessing you mean a right angled triangle. The hypotenuse is the longest side on a right angled triangle. So it is the side facing / parallel to the right angle.
Can a triangle have right sides?
If you mean can a triangle have 3 equal sides and the answer is yes it can and it is called an equilateral triangle.
What type of triangle so stopredicular lines?
If you mean what type of triangle has perpendicular lines then it is right angle triangle.
What does hypotinuse mean?
the longest side of a right triangle
What does a right triangle birthmark on the left leg mean?
It does not mean anything in particular.
How do you determine that the triangle is a right triangle?
If a triangle has a right angle, it is a right triangle.
What does Hypotenus mean?
The hypotenuse is the long side of a right triangle.
Is the angles 11 60 and 61 a right triangle?
If you mean dimensions of 11, 60 and 61 then yes they will form a right angle triangle.
What kind of triangle has a right angle?
A right triangle is a triangle with a right angle.a right triangle is a triangle with 1 side as a right angle
