A triangle is used in construction to make sure something is square or to square something up. A speed square is a small triangular shaped tool used to mark rafter angles. One method to check the square of a room or one wall that is perpendicular to another is to measure 3 feet along one wall and make a pencil mark them measure 4 feet along the other wall and make a pencil mark. Then measure diaganally from pencil mark to pencil mark. If the number is 5 feet the two walls are square to each other.
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The following is the answer.
segment bisector
All of the radii of a circle are congruent CPCTC sss triangle congruence postulate
An equilateral triangle is a regular polygon because it has 3 equal sides and 3 equal 60 degree angles that add up to 180 degrees.
Triangles are used in structures because a triangle is a very stable shape that cannot be stretched or squashed easily - unlike rectangles which can easily become parallelograms.