the formula for the arc of a triangle is the arc length is equal to the angle times the radius.
s=arc length
theta=angle made y length of the arc lenth
r=radius
s=theta times radius
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They are many ways to find the formula of a triangle. Base times height divided by 2
Heron created a formula to find the area of any triangle given three side lengths. It is known as Heron's Formula.
By using Pythagoras' theorem for a right angle triangle.
To find the circumradius of an isosceles triangle, the formula is:1/8[(a^2/h)+4h]in which h is the height of the triangle and a is the base of the triangle.
The sum of the angles in ANY triangle (equiangular or not) is 180 degrees.