Question

What is the value of d?

Answer 1

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

d=57

Answer 2

57

Explanation:

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

d=57