A square is cut out of a copper sheet. Two straight scratches on the surface of the square intersect forming an angle. The squar
e is heated uniformly. As a result, the angle between the scratches a) increases
b) decreases
c) stays the same
d) The answer depends on whether θ is an acute or obtuse angle.
The Triangle Sum Theorem states that the sum of the angles of a triangle equal 180°. Therefore, 45° + 62° + k = 180 107° + k = 180 k = 73° The value of k is 73°
