Assertion: rhombus's area | /r/HasProperty | a 2 = 2 5
Facets:
Source sentences:
text: The area of the golden rhombus in terms of its edge length a {\displaystyle a}  A = ( sin ⁡ ( arctan ⁡ 2 ) ) a 2 = 2 5 a 2 ≈ 0.89443 a 2 . {