1.If a figure is a square, then it is a rectangle. If a figure is a rectangle, then it is a parallelogram. If a figure is a square, then it is a parallelogram.
2.If Sadie gets a new job, she will go shopping for a new car. Sadie is not going shopping for a new car, so Sadie must not have gotten a new job.
3.If an angle is less than 90°, then it is acute. Angle A is less than 90°, so angle A is acute.
4.If it rains tonight, the game will be canceled. If the game is canceled, the team will go get ice cream. If it rains. tonight, the team will go get ice cream.

what law are these​