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What is angle ABD????

What is angle ABD???? 

Question Image
Grade:9

5 Answers

Sumit Majumdar IIT Delhi
askIITians Faculty 137 Points
7 years ago
Dear student,
From the figure, we can only infer that\angle ABD=\angle BAC+70^{\circ}.
We need some relation between the other set of angles to proceed further.
Regards
Sumit
Saloni Rakholiya
104 Points
7 years ago
are AE and DC parallel??
SHAIK AASIF AHAMED
askIITians Faculty 74 Points
7 years ago
Hello student,
Please find my response to your question below
From Given diagram it has incomplete data to find out the angle BAD i think some conditions like whether AE and DC are parallel or some more information is required to solve this problem.So recheck your question and post it again so that i can provide you a meaningful answer.
Ashwin Satheesh
37 Points
7 years ago
but sir this was the question from the book r d sharma
lesson lines and angles.....
please advice what to do
SHAIK AASIF AHAMED
askIITians Faculty 74 Points
7 years ago
Hello student,
Please find the answer to your question below
Let the extension of line DC be F
70+\angleEAB+\angleBAC=180(linear pair)
\angleEAB+\angleBAC=110
\angleEAC=\angleACF(alternate angles)
\angleEAC+70=180(linear pair)
\angleEAC=110
so \angleACF=110
we can see \angleACF=\angleABD (exterior angles)
so \angleABD=110

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