= 1/2 square inch (π/6)

= 1/2* 1/2

= 1/4

(tan 15 degrees) /( 1 minus the square of tan 15 degrees)

{Use the formula: tan2a = tan2a (2tana)/(1-tan2 (a))}

= 1/2tan30 degrees

= (root number 3)/6