area and perimeter

1. area

2. The perimeter of a circle is called the circumference

3. Perimeter is the distance around a two-dimensional shape.

4. perimeter

5. surface

5.1. length × width

5.1.1. Divide the shape into squares

6. Shapes

6.1. Simple shapes

6.2. Compound shapes

6.2.1. tight compacted shape

6.3. A compound shape is editable art consisting of two or more objects