Respuesta :

Answer:

ANGLE SUM PROPERTY OF A TRIANGLE

Step-by-step explanation:

PROPERTY 1  :   Angle sum property of triangle states that the sum of interior angles of a triangle is 180°.

PROOF : Draw a triangle , then mark each angle as A , B , and C . then take a compass and mark three ark in three sides of a triangle and cut the angles of B and C , then join the two angle B and C with angle A . Then you will find there a COMPLETE ANGLE .

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The sum of the measures of angles of triangle is equal 180°.

Look at the picture.

We have the congruent corresponding angles and the vertical angles.

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