Question
In any triangle ABC, show that
Hence, prove that if sides a,b,c are in A.P., are in A.P.
Solution
∴
Hence,
Similarly, and
Now, are in A.P.
if are in A.P.
if are in A.P.
if are in A.P.
if are in A.P.
if are in A.P.
if a, b, c are in A.P.
which is true (given)
if are in A.P.
if are in A.P.
if are in A.P.
if are in A.P.
if a, b, c are in A.P.
which is true (given)