Triangles equal 180. The bottom left corner is 90 in this triangle. Add the angles together set equal to 180.
x = unknown angle
90 + 67 + x= 180
157 + x= 180
subtract 157 from both sides
x= 23
ANSWER: x=23
Hope this helps! :)
The square root of √512k2 is 2(2/9) *√k2