Question

What is the distance between (a cos 25, 0) (0, a cos 65)?

Answer 1

length = root{[x1 - x2]^2 + [y1 - y2]^2}
l           = root{[acos25 - 0]^2 +[0- acos65]^2}
l           =root{[a^2cos^2(25)] +a^2cos^2(90-25)}
l           =root{[a^2cos^2(25)] +a^2sin^2(25)}
l           =root{a^2 [cos^2(25)  +sin^2(25)] }
l           =a *root{1}
l           = a//