Question

If a triangle is acute, then all three angles have a measure of 60°.
Provide a counterexample to show that the statement is false.


A)
The three angles could be 30°, 30°, and 30°


B)
The three angles could be 30°, 60°, and 90°


C)
The three angles could be 30°, 70°, and 80°


D)
The three angles could be 30°, 30°, and 120°

Answer 1

The sum of angles in triangle is always 180°

Which counterexample has angles that add up to 180° while all angles are under 90°?

Answer 2

so b?

Answer 3

C

Answer 4

So C.

Answer 5

B adds up to 180 but that would be a right triangle because it has a right angle (90)

Answer 6

Because 60, 70, and 80 are acute and they add up to 180.

Answer 7

@Basher I think you meant 30 70 and 80

I also chose C but because they are all under 90 to be acute