This lesson plan aims to teach students about the four types of angles - acute, obtuse, straight, and right - over three one-hour periods. In the first period, students will watch a video that defines the four angles using pizza slices and does a song. They will then answer worksheet questions about the video. In the second period, the teacher brings in a real or plastic pizza to demonstrate the angles while singing the song, and students name examples. In the third period, the class is divided into groups, each tasked with bringing in a divided cake/pie to demonstrate one of the angles, before completing a final worksheet activity.