+0  
 
+1
185
4
avatar+1442 

Altitudes line AD and line BE of triangle ABC intersect at H. If angle BAC = 46 degrees and angle ABC = 71 degrees, then what is angle AHB?

 

Thanks!

 #1
avatar
0

117 °

Guest Mar 7, 2018
 #2
avatar
0

Just ' follow your nose '.

You know angles A and B, so work out angle C.

You can now work out angles CAH and CBE.

That allows you to work out angles HAB and HBA.

Knowing those allows you to work out AHB.

Job done.

Guest Mar 7, 2018
 #3
avatar+88871 
+1

Here's a pic :

 

 

We don't need as much work as the guest has laid out.....

First find angle ACB  = 180 - BAC  - CBA  = 180  - 180  - 46 - 71 =  63°

EHDC forms a quadrilateral whose interior angles sum to 360°

So   angle EHD  = 360 -  90 - 90 - 63  = 117°

And AHB  is a vertical angle to EHD =  117°

 

 

cool cool cool

CPhill  Mar 7, 2018
edited by CPhill  Mar 7, 2018
 #4
avatar+1442 
+1

Thanks so much everyone!


9 Online Users

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.