Question

Each answer choice shows the measures of the three angles of a triangle.
Which triangle is an acute triangle?
A.30 ,30 ,120
B.40,50,90
C.20,50,110
D.50,50,80

Answer 1

i'm gonna guess C

Answer 2

To be a triangle, all the angles must add up to 180 degrees. (They do.)
To be an acute triangle, all the angles must be smaller than 90 degrees.
Only D meets that requirement.