How to find the missing side of an isosceles triangle

sides isosceles triangle

a  - equal sides

b blue  -  base

alpha green  - angles at the base

beta feolet  - angle formed by the equal sides

 

Calculate the length of equal sides if given side (base) and angle  ( a  ) :

sides isosceles triangle F a1

sides isosceles triangle F a2

 

Calculate the length of a side (base) if given equal sides and angle ( b  ) :

sides isosceles triangle F b1

sides isosceles triangle F b2