(((Please help asap! Giving brainliest))) For a triangle DEF classified as equilateral, which statement must be true? (6 points)

Select one:

a. At least two sides are congruent.

b. Two sides are perpendicular.

c. All three sides are congruent.

d. Two sides are parallel.

Step-by-step explanation:

equilateral triangle all 3 sides are equal or congruent

the answer is b.

step-by-step explanation:

by the trigonometric ratio tangent, tangent equals opposite divided by adjacent.

therefore, tan(50) equals ac/3

multiply each side by 3 to get: ac=3tan(50)

the answer is b.