Q.4. Find the values of the unknown angles in the following figures:
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Here, ABCD is quadrilateral.
∠A=110
o
,∠B=100
o
,∠C=x
o
∠D=90
o
[ Given ]
Sum of angles of of quadrilateral is 360
o
.
⇒ ∠A+∠B+∠C+∠D=360
o
⇒ 110
o
+100
o
+x+90
o
=360
o
⇒ 300
o
+x=360
o
∴ x=60
o
.
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