Home » Ask & Discuss » Mathematics. » Analytical Geometry « Back to Discussion

Analytical Geometry

New kid on the Block

Joined:	13 Dec 2009
Post:	21

20 Dec 2009 21:29:24 IST

0 People liked this

364

A quadrilateral has sides 2,3,9....diagonals are at rt.angles. Find all possible values of

None

A quadrilateral has sides 2,3,9....diagonals are at right.angles.Find all possible values of the 4th side

p.S got this from another forum

Share this article on:

Comments (3)

kabi

Blazing goIITian

Joined: 11 Jan 2009

Posts: 575

20 Dec 2009 22:11:31 IST

Like 1 people liked this

Check d figure ::

either CD would be of 9 length or CB .

Case I :: when BC=9

AS AC is perpendicular to BD

In triangle

AOD

p²+q²=4

In tri. AOB

q²+r²=9

Also in triangle BOC

s²+r² =81

using eq. I and III in II

gives

p²+s² =76 =CD²

CD=sqrt(76 )

Case II

CD=9

repeat the above method

BC =sqrt(86)

thank u

kabi

Blazing goIITian

Joined: 11 Jan 2009

Posts: 575

20 Dec 2009 22:14:34 IST

Like 1 people liked this

Che

New kid on the Block

Joined: 13 Dec 2009

Posts: 21

20 Dec 2009 22:36:11 IST

Like 0 people liked this

oh....i got teh ans jus after posting here.........anyways thanks

Quick Reply

Reply

	Some HTML allowed.
	Keep your comments above the belt or risk having them deleted.
	Signup for a avatar to have your pictures show up by your comment
	If Members see a thread that violates the Posting Rules, bring it to the attention of the Moderator Team

Free Sign Up!

Preparing for IIT-JEE ?

Arihant Revision Package for IIT JEE - Books, Practice Tests + Rank Predictor

@ INR 1,995/-

For Quick Info

Find Posts by Topics

Physics.

Topics

9391

20087

3671

2186

7614

2826

2636

Mathematics.

Chemistry.

Biology

Institutes

Parents

Board

Fun Zone