Which could be the measures of the three angles of an acute triangle?

A.

45°, 55°, 80°

B.

35°, 45°, 100°

C.

45°, 45°, 90°

D.

20°, 50°, 110°

An acute triangle is going to have all 3 angles less then 90 degrees. But keep in mind, the interior angles of a triangle add up to 180 degrees.

so ur answer is : 45,55,80 ... all angles less then 90, and add up to 180

A triangle is classified as an acute triangle when all of its angles measure are acute which measures less than 90 degrees. Therefore, the correct answer of the given question above would be option A. 45, 55 and 80. Notice that these three angle measurements are below 90 degrees.