I recommend correcting the rhombus formula first. A rhombus perimeter should be:

P = 4a

The area formula can stay as:

A = b × h

For the pentagon section, it would be clearer to write apothem instead of only using h, so students understand the formula better.

TPT Description:

Support geometry students with this clear Perimeter and Area Formulas Poster designed as a practical math reference for reviewing common 2D shape formulas.

This printable poster includes perimeter and area formulas for important shapes such as triangle, square, rectangle, parallelogram, rhombus, trapezium, pentagon, and circle. The clean visual layout helps students quickly identify each shape and connect it with the correct formula during lessons, homework, test review, or independent math practice.

What is included:

• 1 printable perimeter and area formulas poster
• Triangle perimeter and area formulas
• Square perimeter and area formulas
• Rectangle perimeter and area formulas
• Parallelogram perimeter and area formulas
• Rhombus perimeter and area formulas
• Trapezium area and perimeter formulas
• Pentagon formula reference
• Circle circumference and area formulas

Best for:

Geometry, middle school math, upper elementary math, high school math review, homeschool math, special education math support, classroom posters, interactive notebooks, math centers, formula reference sheets, and test preparation.

Use this poster as a helpful visual guide to support students as they review perimeter, area, and common geometry formulas with more confidence.