1.

in a triangle ABC AB perpendicular BC angle ACB is equal to 30 degree ab is equal to 50 then find the length of BC why you not take sin 30 degree​

Answer»

Answer:

In △ABC AB=AC

⇒∠B=∠C (Angles opposite to EQUAL sides are equal)

Now using angle sum property

∠A+∠B+∠C=180

∘

⇒80

∘

+∠C+∠C=180

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⇒2∠C=180

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−80

∘

⇒∠C=

2

100

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=50

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now ∠C+∠x=180

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(Angles made on straight line (AC) are supplementary)

⇒50

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+∠x=180

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⇒∠x=180

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−50

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=130

∘


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