Area and Perimeter Formulas – 1-Page Reference
- Grades
- Grades 6–8, Middle School
- File type
- Microsoft Word
- Subject
- Math, Geometry
- Topic
- Area, formula
- Resource types
- Worksheets & Printables, Worksheets
About this resource
What's inside this resource
Product description
From the author
This is a one page reference sheet for area and perimeter
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In the classroom
Teaching tips & learning objectives
Learning objectives
Identify the correct variable (base, height, side, radius, diagonal) to use in each shape's area and perimeter formula
Distinguish perpendicular height from slant height when calculating area for parallelograms, rhombi, triangles, and trapezoids
Teaching tips
Post as a classroom or notebook reference during a geometry unit covering area and perimeter of polygons and circles.
Highlight the recurring warning about perpendicular vs. slant height, since it applies across four of the eight shapes on the sheet.
Pair with practice problems, since this file is a formula reference only and contains no worked examples or practice items.
Skills covered
Formula selection and variable identification — students match a shape to its correct area and perimeter formula and identify which measurement (base, height, radius, diagonal) each variable represents.
Good to know
Questions teachers ask about this resource
Why does the sheet repeatedly warn against using the 'slant height' in area calculations?
For shapes like the parallelogram, rhombus, triangle, and trapezoid, the slant height (the length of the angled side) is not the same as the perpendicular height between the base and its opposite side — using slant height in the area formula gives an incorrect result, so the sheet calls this out as a common error for each of those shapes.
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