Answer:
d=57
Explanation:
The sum of the interior angles of a triangle is 180 degrees
38 +27 +2d+1=180
Combine like terms
(38+27+1) +2d= 180
66+2d=180
Now, solve for d by isolating it
Subtract 66 from both sides
66-66 +2d=180-66
2d=114
Divide both sides by 2
57
the angles of a triangle together make 180 degrees.
using this, we can find the unknown angle is 115 degrees.
from here, we subtract 1 from both sides of 2d+1=115, then divide by 2, to get the d alone.
114/2=57
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