A.) What operation is involved whenever we put numbers or things together?

• Addition

B.) After putting the pieces together, what do they look like?

• Semicircle

C.) What can you conclude about m<1 + m<2 + m<3?

• We can conclude that the sum of interior angles of a triangle is 180°.

D.) Draw and cut a right triangle. Tear the angles and rearrange them as what you

did in the first triangle. Is your answer in letter c the same? Explain your answer.

• Yes, because a protractor is semicircle that is why we know that the measure of it is 180°

E.) What can you say about the sum of interior angles of a triangle?

• The sum of interior angles of a triangle is always 180°.