Question

Which of these three triangles is impossible to draw? Explain your reasoning.

A triangle where one angle measures 20 degrees and another angle measures 45 degrees.
A triangle where one angle measures 120 degrees and another angle measures 50 degrees
A triangle where one angle measures 90 degrees and another angle measures 100 degrees.

Answer 1

A triangle where one angle measures 90 degrees and another angle measures 100 degrees because a triangle has three angles that add up to 180 degrees and when you add these two together it’s already over 180.