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NCERT Solutions For Class 9 Maths Chapter 7- Triangles It is given that AB = AC and AD = AB. We will have to now prove ?BCD is a right angle. Proof: Consider ?ABC, AB = AC (It is given in the question) Also, ?ACB = ?ABC (They are angles opposite to the equal . NCERT Solutions For Class 9 Maths Chapter 7- Triangles ?ABC = ?PQR (by CPCT) So, ?ABC ? ?PQR by SAS congruency. 4. BE and CF are two equal altitudes of a triangle ABC. Using RHS congruence rule, prove that the triangle ABC is isosceles.. Solution: It is known that BE and CF are Byjus Class 7 Maths Chapter 3 Raw two equal altitudes. Now, in ?BEC and ?CFB. NCERT Solutions For Class 9 Maths Chapter 7- Triangles. Exercise: (Page No: ) 1. Show that in a right angled triangle, the hypotenuse is the longest side. Solution: It is known that ABC is a triangle right angled at B. We know that, ?A + ?B + ?C = � Now, if ?B + ?C = 90� then ?A has to be 90�.
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