If a, b and c are the lenghts of the sides of a triangle, then
.
A triangle with the sides 6 in, 8 in, and 10 in is a right triangle.
In a triangle the sum of any two sides is greater then the third side, and the difference of any two sides is less then the third side.
In a special right triangle 45 - 45 -90 hypotenuse is
2 times greater then any leg.
In an isosceles triangle the base angles are equal in measure.
Area of a parallelogram equals 1/2 bh.
Area of a triangle equals bh.
Sum of interior angles of a convex polygon is 180(n - 2).
Central angle in a circle is 1/2 of the measure of its intercepted arc.
Inscribed angle in a cirle is 1/2 of its intercepted arc.