Calculation: 6pY6sg - 1

S  = 
 
 1
/ 2
* d^2* sin(φ)
S =  
 1
/ 2
* d^2* sin(φ)
$$S$$ = $$\frac{1}{2}\cdot d^{2}\cdot sin(\phi)$$
S =  
 d^2* sin(φ)
/ 2
$$S$$ = $$\frac{d^{2}\cdot sin(\phi)}{2}$$
S =  0.5* d^2* sin(φ)$$S$$ = $$0.5\cdot d^{2}\cdot sin(\phi)$$