If (r2–r1)(r3–r1) = 2r2r3. Show that A = 90. please give the answer
avinash , 7 Years ago
Grade 11
Trigonometry> If (r2–r1)(r3–r1) = 2r2r3. Show that A = ...
2 AnswersHarsh Patodia
Last Activity: 7 Years ago
Abin Beni
Last Activity: 6 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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