50 



MATHEMATICS 

 CIRCLE 



TRIANGLES 



D=B + C 



B = D-C 



E' = E B' = B 



The above letters refer to angles. 

 For a right triangle, c being the hypotenuse, 



c= 



c = length of side opposite 

 an acute angle of an 

 oblique-angled triangle. 



= length of side opposite an obtuse 

 angle of an oblique-angled 

 triangle. 



For a triangle inscribed in a semicircle; 

 i. e., any right triangle, 



