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A triangle with all interior angles measuring less than 90° is an acute triangle or acute-angled triangle. If c is the length of the longest side, then a2 + b2 > c2, where a and b are the lengths of the other sides.
https://en.wikipedia.org/wiki/Triangle_(geometry)
Imagine you doubled the triangle (flip it around one of the upper edges) to make a square-like shape (a parallelogram) which can be changed to a simple rectangle: THEN the whole area is bh, which is for both triangles, so just one is ½ × bh.
https://www.mathsisfun.com/triangle.html
The triangle inequality states that the sum of the lengths of any two sides of a triangle must be greater than or equal to the length of the third side. That sum can equal the length of the third side only in the case of a degenerate triangle, one with collinear vertices.
https://en.wikipedia.org/wiki/Triangle_(geometry)
Three given angles form a non-degenerate triangle (and indeed an infinitude of them) if and only if both of these conditions hold: (a) each of the angles is positive, and (b) the angles sum to 180°. If degenerate triangles are permitted, angles of 0° are permitted.
https://en.wikipedia.org/wiki/Triangle_(geometry)
Suppose that you had a right angle triangle. Note that if you take it and another copy of it (moved around a bit) the two triangles together can be placed to make a rectangle. This rectangle has four 90 degree angles adding up to 360 degrees. Since the triangles are congruent each triangle has half as many degrees, namely 180. So this is true for any right triangle. Suppose you triangle is not a right triangle. Draw a perpendicular from the vertex opposite the longest side, to the longest side. What you have now is two right triangles which, by the above contain 360 degrees in total. But if you look at the two right angles that add up to 180 degrees so the other angles, the angles of the original triangle, add up to 360 - 180 = 180 degrees.
http://mathcentral.uregina.ca/QQ/database/QQ.09.06/becky1.html
The perimeter is the distance around the edge of the triangle: just add up the three sides: The area is half of the base times height.  1 b is the distance along the base.  h is the height (measured at right angles to the base)
https://www.mathsisfun.com/triangle.html
In a triangle, the pattern is usually no more than 3 ticks. An equilateral triangle has the same pattern on all 3 sides, an isosceles triangle has the same pattern on just 2 sides, and a scalene triangle has different patterns on all sides since no sides are equal.
https://en.wikipedia.org/wiki/Triangle_(geometry)
If the legs of a right triangle have the same length, then the angles opposite those legs have the same measure. Since these angles are complementary, it follows that each measures 45 degrees. By the Pythagorean theorem, the length of the hypotenuse is the length of a leg times √2.
https://en.wikipedia.org/wiki/Triangle_(geometry)
Best Answer: Three are three angles in a triangle which all add up to exactly 180 degrees. No matter what size any of the angles are in a triangle, they all add up to 180 degrees.
https://answers.yahoo.com/question/index?qid=20061107163100AAHIhqu
how many degrees in a triangle.
A triangle have 180 degrees. There are 180 degrees in a triangle.