in triangle ABC,

AB 2 + BC 2 = AC 2   ---------(1)

But, AD 2=  AB 2 + BC 2  + CD 2

               = AC 2  + CD 2   (from (1))

So, by Inverse of Pythagoras Theorem, angle ACD = 900

On Wed, Feb 24, 2016 at 8:28 PM, Mohan Dandinnavar <
[email protected]> wrote:

> Is there a right way asking like this type..
>
> --
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> 5. Are you using pirated software? Use Sarvajanika Tantramsha, see
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-- 
Veena Shanbhag
G.H.S. Halepete, Ujire
Belthangady Taluk

-- 
1. If a teacher wants to join STF, visit 
http://karnatakaeducation.org.in/KOER/en/index.php/Become_a_STF_groups_member
2. For STF training, visit KOER - 
http://karnatakaeducation.org.in/KOER/en/index.php
4. For Ubuntu 14.04 installation,    visit 
http://karnatakaeducation.org.in/KOER/en/index.php/Kalpavriksha 
4. For doubts on Ubuntu, public software, visit 
http://karnatakaeducation.org.in/KOER/en/index.php/Frequently_Asked_Questions
5. Are you using pirated software? Use Sarvajanika Tantramsha, see 
http://karnatakaeducation.org.in/KOER/en/index.php/Why_public_software 
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