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Byju's Answer
Standard VII
Mathematics
Properties of Isosceles and Equilateral Triangles
Match the fig...
Question
Match the figures with their respective unknown angles.
A
80
∘
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B
100
∘
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C
40
∘
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Solution
The sum of all interior angles of a triangle is 180
∘
.
So,
X
=
180
∘
−
(
40
∘
+
60
∘
)
=
80
∘
The exterior angle is equal to the sum of opposite interior angles.
So,
X
=
40
∘
+
60
∘
=
100
∘
The angles opposite to the equal sides of an isosceles triangle are equal.
So,
X
=
40
∘
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