Read what Marcus and Sofia say.

a Draw a triangle. Construct the perpendicular bisector of each side to test Marcus’s theory.
b Look at the triangles that other learners have drawn.
Do you think Marcus is correct?
c Draw another triangle. Construct the bisector of each angle to test Sofia’s theory.
d Look at the triangles that other learners have drawn.
Do you think Sofia is correct?

If you draw the perpendicular bisectors of each side of a triangle, they intersect at a single point. The bisectors of each angle of a triangle meet at a single point.