A line that joins any vertex of a polygon (or polyhedron) to any vertex other than itself or adjacent ones is a diagonal.
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Isosceles
You make the sides diagonal.
Suppose the square is ABCD. Draw the diagonal AC.Mark one point on the diagonal, P (not the midpoint of AC), at a distance x from A. Mark another point, Q, also on the diagonal, at the same distance from C.Then,PBQD is a rhombus,ABPD and BCDQ are arrowheads.Suppose the square is ABCD. Draw the diagonal AC.Mark one point on the diagonal, P (not the midpoint of AC), at a distance x from A. Mark another point, Q, also on the diagonal, at the same distance from C.Then,PBQD is a rhombus,ABPD and BCDQ are arrowheads.Suppose the square is ABCD. Draw the diagonal AC.Mark one point on the diagonal, P (not the midpoint of AC), at a distance x from A. Mark another point, Q, also on the diagonal, at the same distance from C.Then,PBQD is a rhombus,ABPD and BCDQ are arrowheads.Suppose the square is ABCD. Draw the diagonal AC.Mark one point on the diagonal, P (not the midpoint of AC), at a distance x from A. Mark another point, Q, also on the diagonal, at the same distance from C.Then,PBQD is a rhombus,ABPD and BCDQ are arrowheads.
What you do is for example on a cube the lines are diagonal and on a normal square the line is strait! In every 3d shape or anything there is always a diagonal line.
triangle and trrapezium