The related formulas are listed under the calculator for reference. Use the calculator before to input a known value and compute all other values. Solver calculates area, sides, angles, perimeter, medians, inradius. The main points of difference between these three types of triangles are discussed in the following table. Triangle calculator (by the coordinates of vertices). That is, if you know either the length of the sides, the area of the equilateral triangle, the perimeter of the triangle, the radius of the circumscribed circle, the radius of the inscribed circle, or the altitude (height) of the triangle, you can find all other quantities. Triangles are classified into three types - equilateral, isosceles, and scalene triangle based on the sides. ![]() 1īecause of the regular nature of the equilateral triangle, we can determine many of its quantities from a single known value. You can use this formula to find the measure of each angle by plugging in the known side lengths and solving for the angle. In an equilateral triangle, the altitudes, the angle bisectors, the perpendicular bisectors, and the medians to each side coincide. The Law of Cosines states that: c 2 a 2 + b 2 - 2ab cos (C) where c is the length of the side opposite angle C, a and b are the lengths of the other two sides, and C is the measure of the angle opposite side c. ![]() It is also a regular polygon, so it is also referred to as a regular triangle. In the familiar Euclidean geometry, an equilateral triangle is also equiangular all three internal angles are also congruent to each other and are each 60°. ![]() In geometry, an equilateral triangle is a triangle in which all three sides are equal.
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