10 MATHEMATICS 



CIRCLE 



= 3.5449 VI 

 2A 4A 



= 2A/- = 1.1284VA 

 P P 



TRIANGLE 

 Case I Given the base b and the altitude h, 



*-* 



Case II. Given the three sides a, &, and c, 

 A= ^s(s-a)(s-b)(s-c) 



a+b+c 

 in which 5 = 



Case III. Given two sides a and c and the included angle B t 



A = }o c sin B 



Case IV. Given the side b and the angles A, B, and C, 

 6 2 sin A sin C 

 2 sin B 



<r 



