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Question Number 141628 by mathdanisur last updated on 21/May/21

Commented by MJS_new last updated on 21/May/21

what are r, r_a , ...?  rr_a  means r×r_a ?

$$\mathrm{what}\:\mathrm{are}\:{r},\:{r}_{{a}} ,\:...? \\ $$$${rr}_{{a}} \:\mathrm{means}\:{r}×{r}_{{a}} ? \\ $$

Commented by mathdanisur last updated on 21/May/21

yes dear Sir

$${yes}\:{dear}\:{Sir} \\ $$

Commented by mitica last updated on 21/May/21

r_a =ptg(A/2)

$${r}_{{a}} ={ptg}\frac{{A}}{\mathrm{2}} \\ $$

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