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Driehoek.org is a Dutch-language educational website with a very tight focus on “triangles” as a geometry topic. Its content covers the basic definition and types of triangles, area and perimeter, the Pythagorean theorem, sine/cosine/tangent rules, vectors, 3D geometry, and triangulation, along with applications in architecture, navigation, design, computer graphics, and more. It feels more like a specialized knowledge site with a set of learning tools than a full mathematics course platform.
The subject area is concentrated on mathematical geometry. Its strengths are clear scope and relatively strong structure: it includes explanations of triangle types, formula and theorem pages, course materials by education level, historical background, interactive quizzes, and a triangle calculator. The calculator supports input modes such as three sides, two sides with the included angle, two angles and one side, and base plus height. It can calculate area, perimeter, angles, side lengths, centroid, altitudes, and more, while also providing step-by-step explanations and visualizations. The teaching format is mainly web-based text and graphics, self-service tools, and quizzes; there is no indication of live classes, recorded videos, or 1-on-1 tutoring. The teaching language is Dutch, which creates a clear barrier for non-Dutch learners. No information about accreditation or certificates is provided.
The website clearly states that it is free to access and does not require registration. Operationally, it may display ads through Google AdSense, and it states that ads are separated from editorial content. Payment methods are not disclosed, which suggests that it currently does not function like a paid course product. For support, the site provides a contact page for reporting formula errors, suggesting lesson improvements, or pointing out missing topics, but there is no sign of live customer service, a learning community, or a structured Q&A arrangement.
Its advantages are that it is free, lightweight, requires no registration, and offers fairly complete coverage of triangle-related knowledge points. It also turns abstract formulas into steps, examples, and visualizations, making it useful as homework support. The site is also transparent in noting that its calculator uses JavaScript floating-point calculations, so rounding errors may occur and important calculations should be verified with a second source. The downsides are its very narrow scope, meaning it cannot replace a textbook or teacher; it also lacks teacher credentials, course progression, learning assessment, and certificates. For Chinese users, the Dutch-language content will reduce efficiency.
It is suitable for upper primary students, secondary school students, self-learners, and teachers in Dutch-speaking environments as supplementary geometry material. The source text does not provide information about access from China, so it is not possible to judge whether direct access is stable; payment is not a major concern. Chinese-speaking learners looking for alternatives may consider Khan Academy, GeoGebra, Desmos, or resources that accompany domestic textbooks.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on driehoek.org official site.
driehoek.org is an Netherlands Education provider. TG4G tracks its product information, an overall rating of 5.0/10, and a China-accessibility score of Workable. Click "Visit Official Site" to reach driehoek.org directly.