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Start with segment AB of length 7. With a protractor get a 40 deg. angle at A, then draw segment AD of length 7. Draw segments parallel to AB and AD to finish the rhombus; you can use your protractor to put 140 degree angles at B and D, for example (as the opposite sides of a rhombus are parallel, the angles made by these parallel sides with the adjacent side between them add up to 180 degrees).
The idea is to notice that your rhombus ABCD is actually made of 2 equilateral triangles And if you build a perpendicular to AB in point B, which intersects AD at E, you create a right-angled triangle ABE that can fit inside it all of the orange area.
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