Math, asked by sksinha7043, 16 days ago

Find the value of x form fig
a. 70 b. 55 c. 35 d. 110

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Answers

Answered by brainlyapp716
0

Answer:

b)55°

Step-by-step explanation:

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Answered by ExElegant
1

Given :-

In the above figure -

\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:  \rm{\pink{\angle \: AOB \: \: = \: \:  70\degree}}

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To Find :-

\: \: \: \: \: \: \: \rm{Discover \: \: the \: \: value \: \: of \: \: x \: \: ?}

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Solution :-

as we have given -

\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:  \rm{\angle \: AOB \: \: = \: \: 70\degree \: \: \: -(1)}

from considering the circle -

OA and OB are the radius of this circle.

\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \rm{\pink{OA \: \: = \: \: OB}}

Since ,

two sides are equal of the ∆OAB.

So -

OAB is an \rm{\purple{ \: isosceles \: \: triangle \: }}and equal sides have equal angles .

then -

\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:  \rm{\angle \: OAB \: \: = \: \: \angle \: OBA \: \: \: \: -(2)}

now -

Sum of all three angles of a triangle is \rm{\purple{\: 180\degree \: }}.

Then -

\: \: \rm{\angle \: AOB \: + \: \angle \: OAB \: + \: \angle \: OBA \: \: = \: \: 180\degree}

from eqⁿ(2) -

\: \: \rm{\angle \: AOB \: + \: 2\angle \: OAB \: \: = \: \: 180\degree}

from eqⁿ(1) -

\: \: \: \: \: \: \: \: \: \: \rm{70\degree \: + \: 2\angle \: OAB \: \: = \: \: 180\degree}

\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \rm{2\angle \: OAB \: \: = \: \: 180\degree \: - \: 70\degree}

\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \rm{2\angle \: OAB \: \: = \: \: 110\degree}

\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \rm{\angle \: OAB \: \: \: = \: \: \: 55\degree}

Hence -

\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \rm{\underline{\boxed{\purple{ \: x \: \: \: = \: \: \: \: 55\degree \: }}}}

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