Maharashtra State Board course SSC (English Medium) Class 10th Board Exam
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Some Question and Their Alternative Answer Are Given. Select the Correct Alternative. in ∆Abc, Ab = 6 √ 3 Cm, Ac = 12 Cm, Bc = 6 Cm. Find Measure of ∠A. - Geometry

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Question

Some question and their alternative answer are given. Select the correct alternative.

 In ∆ABC, AB = \[6\sqrt{3}\] cm, AC = 12 cm, BC = 6 cm. Find measure of ∠A.

  • 30°

  • 60° 

  • 90°

  • 45°

Solution

In ∆ABC, AB = \[6\sqrt{3}\] cm, AC = 12 cm, BC = 6 cm.

AB2 =  `(6sqrt(3))`2 = 108
AC2 = (12)2 = 144
BC2 = (6)2 = 36
108 + 36 = 144

In a triangle, if the square of one side is equal to the sum of the squares of the remaining two sides, then the triangle is a right angled triangle.

In a right angled triangle, if one side is half of the hypotenuse then the angle opposite to that side is 30°.
Here, BC is half of AC.

Thus, measure of ∠A is 30°

Hence, the correct option is 30°
  Is there an error in this question or solution?

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Solution Some Question and Their Alternative Answer Are Given. Select the Correct Alternative. in ∆Abc, Ab = 6 √ 3 Cm, Ac = 12 Cm, Bc = 6 Cm. Find Measure of ∠A. Concept: Apollonius Theorem.
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