. Start by drawing a straight diagonal line going up from the edge of your paper. Don’t make the line too long, or else you won’t be able to fit the rest of the cap on the page. At the end of your first line, add another diagonal line going down that’s the same length and angle as the first one. Make a line that is parallel to the first one you drew starting from the end of the second line. Finally, connect the ends of the first and last line you drew.
The rhombus will look like a sideways diamond where each side is the same length.
If you want your rhombus's sides to be precise, you can use a ruler or straightedge.