Answer:
D. Acute
F. Scalene
Explanation:
We have been given a diagram of a triangle. We are asked to classify our given triangle.
Let us check our given choices one by one.
A. Right
We know that a triangle is known as right triangle, when it has a 90 degree angle. Since none of the given angles measure 90 degree, therefore, option A is not a correct choice.
B. Obtuse
We know that an obtuse angle has measure greater than 90 degrees and less than 180 degrees. Since all angles measure less than 90 degree, therefore, our given triangle is not obtuse and option B is incorrect.
C. Equilateral
An equilateral triangle has all angles with 60 degrees. Since each angle of triangle is different, therefore, our triangle is not equilateral and option C is incorrect.
D. Acute
We know that an acute angle has measure less than 90 degrees. Since all angles measure less than 90 degree, therefore, our given triangle is an acute triangle and option D is correct choice.
E. Isosceles
An isosceles triangle has two angles with equal degrees. Since each angle of triangle is different, therefore, our triangle is not isosceles and option E is incorrect.
F. Scalene
A scalene triangle's all sides and angles have different measure. Since all angles and sides of given triangle are different, therefore, our triangle is scalene and option F is correct.