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Explore the beautiful world of Origami and mathematics. Be amazed by stunning photographs, try our folding instructions, or learn about the mathematical background.
But our world is actually three-dimensional, so lets have a look at some 3D solids that are based on circles: A cylinder consists of two congruent, parallel circles joined by a curved surface. A cone has a circular base that is joined to a single point (called the vertex).
The Mathematical Playground. Free tools, courses and manipulatives to make online learning more interactive and engaging than ever before. Polypad has moved from Mathigon to Amplify – read our FAQs for more details.
But our world is actually three-dimensional, so lets have a look at some 3D solids that are based on circles: A cylinder consists of two congruent, parallel circles joined by a curved surface. A cone has a circular base that is joined to a single point (called the vertex).
Polyhedra with these two properties are called Platonic solids, named after the Greek philosopher Plato. So what do the Platonic solids look like – and how many of them are there? To make a three-dimensional shape, we need at least faces to meet at every vertex.
Introduction, Nets and Surface Area, Prisms and Pyramids, Cylinders and Cones, Spheres.
Geometric shapes are everywhere around us. In this course you will learn about angels, polygons, tessellations, polyhedra and nets.
3D Solids. Introduction, Parallelograms, Triangles, Polygons, Circles and Circumferences, Area of Circles.
Introduction, Nets and Surface Area, Prisms and Pyramids, Cylinders and Cones, Spheres.
Zhu shows how to solve problems using systems of polynomial equations with up to four unknown variables, 天 (Heaven), 地 (Earth), 人 (Man) and 物 (Matter). He explains how to eliminate variables and how to find the side length of two and three-dimensional shapes given their volume or area.