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प्रश्न
In a ΔABC, if AB = AC and ∠B = 70°, find ∠A.
थोडक्यात उत्तर
उत्तर
Consider ΔABC, we have 70 B and AB =AC
Since, AB=AC ΔABC is an isosceles triangle
⇒ ∠B= ∠C [Angles opposite to equal sides are equal]
⇒ ∠B= ∠C=70°
And also ,
Sum of angles in a triangle= 180°
⇒ ∠A+ ∠B+∠C=180
⇒∠A+70°+70°=180
⇒∠A+140°=180°
⇒∠A=180°-140° ⇒ ∠ A=40°
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