Mississippi Math FA.G.38

MathGrades 9–12Geometry (G) Geometry

The Standard

Fluently use formulas and/or appropriate measuring tools to find length and angle measures, perimeter, area, volume, and surface area of polygons, circles, spheres, cones, cylinders, pyramids, and composite or irregular figures. Use them to solve real-world and mathematical problems. (8.G.9)

2025 Mississippi College- and Career-Readiness Standards for Mathematics

Teacher's field guide

What This Standard Means

What Students Need to Do: Students use measuring tools and formulas to find lengths and angles. They calculate perimeter, area, surface area, and volume for flat shapes, solids, and combined figures. They use the results to solve problems about real objects.
What Mastery Looks Like: Given a diagram or object, students choose the needed measurements and the right formula without a hint. They split combined figures into familiar parts and label answers in linear, square, or cubic units.
Common Misconceptions: Students may use diameter instead of radius or confuse circumference with area. They may use a cone's slant height instead of its vertical height. They may count hidden faces in surface area or label volume in square units.
How to Assess It: Exit ticket: A closed cylinder has radius 3 cm and height 8 cm. Find its volume and total surface area, and label each answer with the correct units.

Lesson moves

Ways to Teach It

Have pairs measure a cereal box and soup can with rulers, then calculate each object's surface area and volume.
Ask students to sketch two ways to split an L-shaped floor plan, then write which area calculation is easier and why.
Give teams diagram cards showing a triangle, circle, cone, sphere, and pyramid; have them find the labeled measure and check units.
Measure a classroom wall and a door, then use a paint can's coverage label to estimate paint needed for the exposed wall.

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