Question

How can a rectangle be cut into equilateral triangle?

Answer 1

Make a Triangle from a Rectangle

Fold and unfold the rectangular sheet of paper in half lengthwise. 



Fold the top-right corner of the paper down so the corner meets the crease made in step 1 (join the dots). The crease made should intersect with the bottom-right corner.





Fold left side of the paper over the flap made in step 2. Use the raw edge of the flap as a guide to position this fold. 




Unfold and cut along the creases to get an equilateral triangle. Easy

Answer 2

Draw two diagonal from one point to its point.
Then the triangle form will be equilateral triangle