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3fB2fW - 1
Calculation: 3fB2fW - 1
S
=
R
*
l
/
2
S
=
R
*
l
/
2
$$S$$
=
$$\frac{R\cdot l}{2}$$
S
=
0.5
*
R
*
l
$$S$$
=
$$0.5\cdot R\cdot l$$