Take a triangular piece of paper and make three different types of mar

1.	Take a triangular piece of paper and make three different types of marks near the three angles. Take a point approximately at the center of the triangle. From this point, draw three lines that meet the three sides. Cut the paper along those lines. Place the three angles side by side as shown. See how the three angles of a triangle together form a straight angle, or, an angle that measures 180°.
Answer» The three angles of the triangle form a straight angle. Hence, the sum of the measures of the angles of a triangle is 180°.

Take a triangular piece of paper and make three different types of marks near the three angles. Take a point approximately at the center of the triangle. From this point, draw three lines that meet the three sides. Cut the paper along those lines. Place the three angles side by side as shown. See how the three angles of a triangle together form a straight angle, or, an angle that measures 180°.

Answer»

The three angles of the triangle form a straight angle.

Hence, the sum of the measures of the angles of a triangle is 180°.