The first one is not similar but the second one is For the second on if you flip the smaller trapezoid (vertically and horizontally)then the corresponding angles are decreased by a factor of 3 15/3=5 24/3=8 and so on The first one does not have a pattern like this so that is why they are not similar
Multiplying or dividing both sides of an equation by a negative number changes the inequality of the equation, because it changes the sign of each side of the equation
