Octahedron
An octahedron is a three-dimensional geometric shape that has eight triangular faces, twelve edges, and six vertices. Each face of an octahedron is an equilateral triangle, meaning all three sides are of equal length.The octahedron is one of the five Platonic solids, which are convex polyhedra with equivalent faces, equal angles, and the same number of faces meeting at each vertex. The other Platonic solids are the tetrahedron, cube (or hexahedron), icosahedron, and dodecahedron.To calculate the surface area of an octahedron, use the formula:\[A = 2 \times \sqrt{3} \times s^2\]Where \(s\) represents the length of a side of one of the equilateral triangles.To calculate the volume of an octahedron, use the formula:\[V = \frac{1}{3} \times \sqrt{2} \times s^3\]Where \(s\) represents the length of a side of one of the equilateral triangles.Study Guide: Octahedron
.◂Math Worksheets and Study Guides Eighth Grade. Applications of percent
Study Guide
Applications of percent 
Worksheet/Answer key
Applications of percent Worksheet/Answer key
Applications of percent Worksheet/Answer key
Applications of percent Worksheet/Answer key
Applications of percent
Worksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyThe resources above cover the following skills:
Number and Operations (NCTM)
Understand numbers, ways of representing numbers, relationships among numbers, and number systems.
Work flexibly with fractions, decimals, and percents to solve problems.