pythogoras
The sum of the three interior angles of a triangle is always 180 degree is known as angle sum property of a triangle.
Euclid and Pythagoras.
The angles of a quadrilateral add to 360 degrees.
This is not possible. If a triangle is a Right angled triangle then the sum of the two angles which are not right will be = 90 [Angle Sum Property] That's why you see.
In a triangle, the sum of the angles is always 180 degrees. This is known as the angle sum property of triangles. Additionally, the largest angle in a triangle is always opposite the longest side, and the smallest angle is opposite the shortest side.
The sum of one angle is simply the measure of that angle.
measure of exterior angle of triangle is equal to sum of interior angles. for eg. In triangle ABC, angle C is exterior angle angle A and angle B are interior angles so, C=A+B
angle sum of a parallelogram
the angle sum of a pentagon is 540.
In a triangle, the sum of the three angles is always 180 degrees. This relationship is known as the angle sum property of a triangle.
An angle sum is the sum (in degrees) of the particular angles you are measuring.