If the length of diagonal of regular pentagon is b and side length is a,prove thata^2/b^2+b^2/a^2=3 ???
Sathya , 13 Years ago
Grade 10
Algebra> Tricky question!!!...
1 Answers
Shyama P
Last Activity: 13 Years ago
consider right triangle AOB
angle OAB =54 degree
sin54=b/2a
b=2asin54
sub in eq.
a2/(4a2sin254) + (4a2sin254)/a2 =3
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