Understanding and applying these facts, theorems, and laws is critical to anyone who studies geometry. Exterior Angle: An exterior angle of a triangle is equal to the sum of the two opposite interior angles.Īrea Calculation: The area $$$A $$$ of a triangle with the side $$$b $$$ and the height $$$h $$$ dropped to this side can be found using the following formula: $$A=\frac $$.Angle Sum: The sum of the interior angles of any triangle is always 180 degrees.What Are Some Key Facts, Theorems, and Laws Related to Triangles? Triangles are fundamental shapes in geometry and have various properties and theorems associated with them. Right-Angled Triangle: One of the angles is exactly 90 degrees, making it a right angle.Obtuse Triangle: One of the angles is greater than 90 degrees.Acute Triangle: All three angles are less than 90 degrees.Scalene Triangle: All sides have different lengths and all angles have different measures.Isosceles Triangle: It has two sides of equal length, and the angles opposite those sides are also equal. ![]()
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