Atriangle with all sides of equal length is a triangle.
a. right
b. scalene
c. equilateral
d. isosceles

A).  right triangle . . . any triangle with one right angle inside,
                                no matter what the side-lengths are

B).  scalene triangle . . . any triangle with no two equal sides

C).  equilateral triangle . . . any triangle with all three sides the same length

D).  isosceles triangle . . . any triangle with any two sides the same length

Arhombus is a quadrilateral.

We need the pictures of the graphs