find the unknown angle x
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∠BCA+75
o
=180
o
∴∠BCA=105
o
Sum of interior angles of a Δle=180
o
105
o
+35
o
+x=180
o
∴x=40
o
OR
Since, Exterior angle=Sum of interior opposite angles, therefore x+35
o
=75
o
⇒x=75
o
−35
o
=40
o
.
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