Sketches, nets & projections of solids
Japanese school year: Junior high 1
What you learn
Learn how to represent three-dimensional solids on two-dimensional surfaces using sketches, nets, and orthographic projections. These representations are essential for calculating surface areas and reading design drawings. Prior familiarity with basic plane figures and basic solid geometric shapes is recommended.
Key points
This sketch (perspective drawing) is used to intuitively depict a 3D solid on paper. Drawn from an oblique angle, visible edges are shown as solid lines and hidden edges as dashed lines.
This drawing (net) is used to calculate surface area or understand how to assemble a 3D shape. It shows the solid cut open along its edges and unfolded flat onto a single plane.
This orthographic projection is used to accurately record the dimensions and shape of a 3D object. It aligns the front view (elevation) and the top view (plan) vertically.
Choose a set to practice.