Which of the following is a type of face found on a platonic solid?
a. right triangle
b. isosceles triangle
c. acute triangle
d. equilateral triangle

D. Equilateral triangle

Step-by-step explanation:

Every face is a regular polygon of the same size and shape. Example: each face of the cube is a square.

So, out of the given options, equilateral triangles is the answer.

Each vertex of a regular triangle is 60°. And there can be 3, 4, or 5 triangles meeting at a vertex but all will be equilateral triangles. For example:  a tetrahedron.

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value