Angle B of triangle ABC is an acute angle and AD perpendicular BC prov

1.	Angle B of triangle ABC is an acute angle and AD perpendicular BC prove that AC2 =AB2+BC2-2BC-BD2
Answer» Answer: ANSWER Since triangles ABd and ACD are right angled at D. Therefore, AB 2 =AD 2 +BD 2 ......................1 And, AC 2 =AD 2 +CD 2 ........................2 Subtracting 2 from 1 we get AB 2 −AC 2 =BD 2 −CD 2

Angle B of triangle ABC is an acute angle and AD perpendicular BC prove that AC2 =AB2+BC2-2BC-BD2

Answer»

Answer:

ANSWER

Since triangles ABd and ACD are right angled at D.

Therefore, AB

+BD

......................1

And, AC

=AD

........................2

Subtracting 2 from 1 we get

−AC

=BD

−CD