Question 38
The angle $A$ of an isosceles triangle $ABC$ measures $2/5$ from a right angle, the angles $B$ and $C$ being equal. The bisector of angle $C$ cuts the opposite side at point $D$. Calculate the measures of the angles of the triangle $BCD$. Express the measurement $a$ of the side $BC$ as a function of the measurement $b$ of the side $AC$, without trigonometric ratios appearing in the expression.