Triangles are one of the most fundamental geometric shapes and have a variety of often studied properties including: Show Rule 1: Interior Angles sum up to $$ 180^0 $$  Rule 2: Sides of Triangle -- Triangle Inequality Theorem : This theorem states that the sum of the lengths of any 2 sides of a triangle must be greater than the third side. ) Rule 3: Relationship between measurement of the sides and angles in a triangle: The largest interior angle and side are opposite each other. The same rule applies to the smallest sized angle and side, and the middle sized angle and side. Rule 4 Remote Extior Angles-- This Theorem states that the measure of a an exterior angle $$ \angle A$$ equals the sum of the remote interior angles' measurements. more) Do all triangles add up to 180?The angle sum of a triangle will always be equal to 180°. The angle sum of a quadrilateral is equal to 360°, and a triangle can be created by slicing a quadrilateral in half from corner to corner. Since a triangle is essentially half of a quadrilateral, its angle measures should be half as well. Half of 360° is 180°.
What are the 3 angles of a triangle?
Is a triangle 180 or 90?The sum of the angles in a triangle is 180. A right triangle has one angle of 90. Thus, the sum of the other two angles will be 90.
Do all 3 angles of a triangle add up to 360?A triangle's angles add up to 180 degrees because one exterior angle is equal to the sum of the other two angles in the triangle.
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What is the total angle of a triangle
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