Abstract
This chapter focuses on shapes. Each corner of a rectangle is a right angle. Sheets of paper, walls, and windows are examples of rectangles. A square is a rectangle in which all sides have equal length. Two line segments on a flat surface are called parallel if they do not meet, no matter how far extended. A parallelogram is a four-sided figure consisting of four line segments, with opposite sides parallel. A rectangle is a parallelogram whose corners are right angles. A parallelogram, with all sides equal in length, is a diamond or a rhombus. The cutting line of the parallelogram is an altitude. An altitude is a perpendicular line segment from one side of the parallelogram, called the base, to the opposite side. The chapter also discusses three-dimensional objects, such as rectangular solids and cylinders.
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