In Delta ABC Prove that cos A + co...

In ` Delta ABC ` Prove that
` cos A + cos B+ cos C =1 + ( r ) / ( R ) `

Text Solution

Verified by Experts

The correct Answer is:

`1+ ( r)/( R ) = R.H.S.`

Promotional Banner

Promotional Banner

Topper's Solved these Questions

PROPERTIES OF TRIANGLES
VIKRAM PUBLICATION ( ANDHRA PUBLICATION)|Exercise TEXTUAL EXERCISES ( EXERCISE - 10(b) ) II.|6 Videos
PRODUCT OF VECTORS
VIKRAM PUBLICATION ( ANDHRA PUBLICATION)|Exercise SOLVED PROBLEMS|46 Videos
STRAIGHT LINE
VIKRAM PUBLICATION ( ANDHRA PUBLICATION)|Exercise TEXTUAL EXERCISES (EXERCISE-3(e)) |32 Videos

VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-PROPERTIES OF TRIANGLES-TEXTUAL EXERCISES ( EXERCISE - 10(b) ) III.

In Delta ABC Prove that cos A + cos B+ cos C =1 + ( r ) / ( R )
Text Solution
|
In DeltaABC" prove that "cos^(2).(A)/(2)+cos^(2).(B)/(2)+cos^(2).(C)/...
Text Solution
|
In Delta ABC Prove that sin ^(2) "" (A)/(2) + sin ^(2) ""(B) /(2...
Text Solution
|
(r2+r3) sqrt((r r1)/( r2r3)) = a
Text Solution
|
In Delta ABC , r1r2 sqrt([( 4R -r1-r2)/( r1+r2)]) =
Text Solution
|
In Delta ABC, r1^2+r2^2+r3^2+r^2=
Text Solution
|
If p1,p2,p3 are the lengths of the altitudes from the vertices A,B,C o...
Text Solution
|
If p1,p2,p3 are the lengths of the altitudes from the vertices A,B,C o...
Text Solution
|
If p1,p2,p3 are the lengths of the altitudes from the vertices A,B,C o...
Text Solution
|
In a /\ABC if a = 13,b=14,c=15 then S.T R = (65)/8 , r=4, r(1) = (21)/...
Text Solution
|
If r(1)=2,r(2)=3,r(3)=6and r=1, prove that a=3,b=4 and c=5.
Text Solution
|