Answer:
90
Explanation:
Since sum of all the angles of any quadrilateral is 360 degrees
115 + 97 + 58 + x = 360
Solve for x:
Add the numbers
270 + x = 360
Rearrange terms
x + 270 = 360
Subtract 270 from both sides of the equation
x + 270 - 270 = 360 - 270
Simplify
x = 90
Missing angle = 90
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