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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

$$\mathrm{what}\mathrm{are}r,r_a,...?$$$${rr}_a\mathrm{means}r\times r_a?$$

Commented by mathdanisur last updated on 21/May/21

$$yesdearSir$$

Commented by mitica last updated on 21/May/21

$$r_a=ptg\frac{A}{2}$$

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