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If a triangle has angles whose measures are 55 degrees and 80 degrees, what is the measure of the third angle? 

WindsorLynne  Aug 17, 2018
 #1
avatar+91160 
+2

The sum of the interior angles of a triangle  = 180°

 

Let  x  be the unknown angle...so we have...

 

55 + 80  +  x  = 180

 

135 + x  = 180     subtract  135 from both sides

 

x  = 45°

 

 

cool cool cool

CPhill  Aug 17, 2018
 #2
avatar+27 
+2

Thank you!!

WindsorLynne  Aug 17, 2018
 #3
avatar+91160 
+1

Glad to  help....where I can....

 

 

cool cool cool

CPhill  Aug 17, 2018

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