Chapter 2.7, Problem 4PSA

To determine

To prove : The summation of $BC+EF=AD$ is to be proved

Explanation of Solution

Given information : The following information has been given

  $BC+BE=AD$

  $BE=EF$

Formula used : Basic substitution method has been used

Proof : We substitute the value of EF from the last equation and put it in the first one. We get

  $BC+EF=AD$

Hence, the required summation is proved