Answer:
In the given figure,
is an equilateral triangle such that
Now,
...(i)
[ angle opposite to equal sides are equal]
Similarly,
...(ii)
[ angle opposite to equal sides are equal]
From Eqs. (i) and (ii), we get
...(iii)
Now,
[ sum of three angles of a triangle is 180°]
From Eq. (iii), we get
and is an isosceles right triangle.
[ angle opposite to equal sides are equal] ...(iv)
and [given]
Now,
[sum of three angles of a triangle is 180°]
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