+0  
 
0
38
2
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 Apr 22, 2020
 #1
avatar+1455 
+4

These are all right triangles, and since there are 180 degrees in a triangle, there are 90 'spare' degrees.

 

For the first one with side length 13 and degree 52.  90 - 52 = 38 degrees.

 

For the one with length 12 and degree 37. 90-37 = 53 degrees.

 

For the one with side lengths 10 and 13. Use tangent. tan(a) = 13/10 = 1.3; tan(b) = 10/13 = .769 

 

ceta is 37 and  

 

https://www.mathopenref.com/trigtangent.html

 

For the one with angle 73. 90-73 = 17.

 Apr 22, 2020
 #2
avatar+18 
+1

Thank you H!!!

 Apr 22, 2020

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