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I've been stuck on this problem for a long time now. Any help would be super appreciated!

 

What is the measure of $\angle D$?

Express your answer in degrees rounded to the nearest whole degree.

 

 Mar 21, 2021
edited by wafflestraw  Mar 21, 2021
edited by wafflestraw  Mar 21, 2021
 #1
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Let angle D be x. If 2 sides of a triangle are congruent, then 2 of the angles are also congruent. Therefore, we can label the triangle like this:

For the rightmost triangle, we can set up an equation:

\(5x+5x+90-4x=180\)

Can you take it from there?

 Mar 22, 2021
 #2
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Thank you so much! I got it! laugh

wafflestraw  Mar 22, 2021
 #3
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Use the WHOLE triangle in the diagram

 

x + 5x  + 90 = 180       solve for x

 Mar 22, 2021

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