3.
आकृति में, यदि एक वृत्त के परिगत त्रिभुज ABC है, तो AB की लम्बाई है
(a) 12 सेमी
(b) 13 सेमी
(c) 14 सेमी (d) 15 सेमी
If AABC is circumscribing a circle in the figure, the length of AB is
(a) 12 cm
(b) 13 cm
(c) 14 cm (d) 15 cm
Answers
Answered by
2
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
∘
⇒2∠C=180
∘
−80
∘
⇒∠C=
2
100
∘
=50
∘
now ∠C+∠x=180
∘
(Angles made on straight line (AC) are supplementary)
⇒50
∘
+∠x=180
∘
⇒∠x=180
∘
−50
∘
=130
∘
@ARSH
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