Question

NCERT Solutions for Class 9 Maths Exercise 7.2.first 5 questions.please.please short answer karna.....

Answer 1

Step-by-step explanation:

IN ∆ ABC

AB=AC( given)

angleABC= AngleACB (OPP.angle in isosceles triangle are equal)

BC =BC ( common)

IN ∆BDC

BD=DC ( Given)

Angle DBC= Angle DCB (OPP.angle in isosceles triangle are equal)

BC=BC ( common )

So ∆ABC congruent to ∆DBC BY (SAS) CONGRUENCE RULE.

Therefore,

Angle ABC + Angle DBC = Angle ACB + Angle DCB

So, Angle ABC = Angle ACD

Hence proved.......

so isuu this is your answer (^～^)