Surface Area of Prisms | 8th Grade Math – Geometry
Perfect for students in traditional classrooms, homeschool families, and anyone who needs a clear math explanation!
Learn how to find the surface area of rectangular and triangular prisms using nets and formulas in this 8th grade geometry lesson.
✏️ Topics covered:
• Defining surface area as the sum of the areas of all exterior faces of a 3D solid
• Using a net to unfold and identify all faces of a rectangular prism
• Surface area of a rectangular prism: SA = 2lw + 2lh + 2wh
• Understanding the three pairs of congruent opposite faces
• Identifying the 5 faces of a triangular prism: 2 congruent triangular bases + 3 rectangular lateral faces
• Calculating the area of each triangular face: A = ½ × base × height
• Calculating the area of each rectangular lateral face: A = length × width
• Total surface area of a triangular prism: 2(triangle area) + sum of three rectangle areas
• Real-world surface area applications: painting, wrapping, and packaging
📚 Mrs.D Math helps students master math one lesson at a time.
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TEKS 8.7B
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