1.

IfP_1 , P_2 , P_3are lengths ofaltitudesof a triangle from itsverticesto the oppositesidesthen(1)/(p_1) + ( 1)/(P_2) +(1)/(p_3)=

Answer»

`(1)/( r_1) `
` ( 1)/(r_2)`
`( 1)/ ( r_3) `
` (1)/ ( R ) `

ANSWER :D


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