Which geometric figure has 120 rotational symmetry? A. rhombus
B. regular pentagon
C. square
D. equilateral triangle

A figure that has 120 rotational symmetry will look exactly the same after the figure is rotated by 120 degrees. An equilateral triangle has 120 rotational symmetry.

When a rhombus, a regular pentagon or a square is rotated by 120 degrees, the resulting shapes do not have the same layout as the initial shape.

However, an equilateral triangle will look the same when rotated by 120 degrees.

I've added an attachment that illustrates the rotation by 120 degrees of an equilateral triangle.

From the attached figures, you can see that points ABC on figure 1 and are changed on figure 2 ; however, both triangles maintain the same layout.

Hence, an equilateral triangle has 120 degrees rotational symmetry

Learn more about rotational symmetry at:

link

D

Step-by-step explanation:

An equilateral triangle, and all regular polygons with 3n sides, thus D.

answer: #1 ads up by 8 and i don't know #2

38.6°

step-by-step explanation:

resultant is 10 pound

smaller force = 8 pound

angle formed = tan⁻¹(

                        =tan⁻¹(

                          =tan⁻¹(0.8)

                        =38.6°