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# Lesson 4.2: Shape Omissions

## Symbols

$\text{△ triangle}$
⠫⠞

$\text{□ square}$
⠫⠲

$\text{○ circle}$
⠫⠉

## Explanation

Sometimes shapes are used to represent the omission of a number, variable, operation, or sign of comparison. The most common shapes used for this are the triangle, circle, and square. However, other shapes may also be encountered. The shape indicator is dots one-two-four-six. A triangle is represented by the shape indicator followed by a lowercase letter t. A circle is represented by the shape indicator followed by a lowercase letter c. A square is represented by the shape indicator followed by a Nemeth four (dots two-five-six).

In these cases, the shape is spaced based on the item they represent.

### Example 1

a triangle representing an omitted sign of comparison such as greater than or less than

$15△20$
⠼⠂⠢⠀⠫⠞⠀⠼⠆⠴

### Example 2

a square representing a missing dollar value

$\square$
⠈⠎⠫⠲

### Example 3

a circle representing a missing numerator in a fraction.

$\frac{○}{4}$
⠹⠫⠉⠌⠲⠼

### Example 4

$2+6=\square$
⠼⠆⠬⠖⠀⠨⠅⠀⠫⠲