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If (r2–r1)(r3–r1) = 2r2r3. Show that A = 90. please give the answer

If (r2–r1)(r3–r1) = 2r2r3. Show that A = 90. please give the answer

Grade:11

2 Answers

Harsh Patodia IIT Roorkee
askIITians Faculty 907 Points
4 years ago
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Abin Beni
13 Points
3 years ago
Do the same and at the last step 
     0 = (b^2+c^2-a^2)
 TO  proove  angle A=90
  Divide by 2bc,
    0 = (b^2+c^2+a^2)/2bc
    By the properties of triangles,
    0 = cos A
    cos A = cos 90
       A=90
       
         

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