Question

X

75°
142°
38°
x = [?]°
Enter the number that goes in the green box.
Enter

Answer 1

x = 105

Explanation:

Assuming this is a quadrilateral, the sum of all the angle measures are 360.

`75+142+38+x=360`

Add like terms

`255+x=360`

Subtract 255 on both sides

`x=105`

To check our work,

`75+142+38+105`

`360`