Question

pls ans ques no. 61 quickly

Answer 1

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Answer 2

hey mate here's your answer.....
and plz refer to the diagram attached to the answer...
we have to construct a line which joins B and D extended to E

in triangle ABD
we know that sum of opposite interior angles is equal to the exterior angle...
so.. angle BAD + angle DBA = angle ADE -------------eq 1
similarly in triangle BDC
angle DBC + angle BCD = angle CDE --------------eq 2

so by adding equation 1 and 2
we get....
angle BAD + angle ABC + angle BCD = angle ADE + angle CDE
angle A + angle B + angle C = angle ADC
HENCE PROVED

HOPE THIS HELP YOU ☺☺☺