Question

Which of these represents the rotation of triangle ABC by 90 degrees counterclockwise about the origin

Answer 1

Answer:

See Explanation

Step-by-step explanation:

Required

Which represents a counterclockwise 90 degrees rotation

No enough details to answer this question. However, I will give a general explanation on how questions like this can be solved

Assume one of the vertex of the triangle is (x,y)

When (x,y) is rotated counterclockwise by 90 degrees, the new point is (-y,x)

Take for instance:

A(2,3)

The new point after rotation will be (-3,2)