Question

Please, help me to workout -- Q-9
Ch-- Relation between two sides of a triangle qnd their verification

Answer 1

Step-by-step explanation:

given ac=ab ; dc=db

in triangle abd and acd

ab=ac (given)

db=dc (given)

ad=ad (common side)

therefore triangle abd is congruent to acd

by cpct,angle bad =angle cad

and angle bda=angle cda

in triangle bao and cao

ab=ac (given)

angle bao=angle cao ( prooved)

ao=ao (common side)

by cpct,

bo = oc

angle boa =angle coa

let angle boa and angle coa be 'x'

they are linear pair so their sum is 180 degrees

therefore x+ x=180

2x=180

x=180/2

x=90

therefore AD bisects BC perpendicularly