Question

in triangle ABC,1/r1+1/r2+1/r3

Answer 1

Answer:

TENSES:Fill in the blanks in the following paragraphs with the most appropriate form

of verbs:

A. My mother (a)............. (do) a lot of work. She (b)

(cook) food and (c)

(clean) the house. Whenever, I (d)

(fallen) ill, she looks after me

well. She (e).... (be) a religious person. She (1) ...... (narrate) many

interesting stories from the Ramayana and the Mahabharata to us at bed time.

B. Vivek has gone to the bank. He (a)

(want) to take out some money. First he

(b).......... (have) to fill in a form for a new check book, as all the cheque in the old

book (c) ..............(has) already been used. He (d) .......... (make) out a cheque for the

amount he (e) ......... (inform) him about the ATM and E-Banking which (g)

(be) introduced shortly. The manager as well as counter clerks (h)

(try) to persuade him to go in for an ATM card.

....

Answer 2

To Prove : 1/r1+1/r2+1/r3=1/r

LHS => 1/(Δ/s-a) + 1/(Δ/s-b) + 1/(Δ/s-c)

= s-a/Δ + s-b/Δ + s-c/Δ

= (s-a+s-b+s-c)/Δ

= {3s+ - (a+b+c)}/Δ

= [3s - 2s]/Δ

= s/Δ { r = Δ/s }

So s/Δ = 1/(Δ/s) = 1/r

LHS = RHS

Proved

follow me please....