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°

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°

geerky42 · Answer

The sum of angles in triangle is always 180°

Which counterexample has angles that add up to 180° while all angles are under 90°?

anonymous · Answer

so b?

anonymous · Answer

C

anonymous · Answer

So C.

anonymous · Answer

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

anonymous · Answer

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

triciaal · Answer

@Basher I think you meant 30 70 and 80

I also chose C but because they are all under 90 to be acute