Learning about three-dimensional shapes still faces challenges because most learning media only present two-dimensional representations, causing students to tend to memorize formulas without fully understanding geometric concepts. This research aims to develop interactive website-based learning media for spatial shapes with 3D visualization to help students understand the concepts in a more engaging way. The method used is the Web Development Life Cycle (WDLC). The website was developed using React, Tailwind CSS, and React Three Fiber and is equipped with 3D object visualizations, learning materials, information on elements and properties of three-dimensional shapes, a geometry calculator, and interactive exercises. Testing was conducted using Black Box Testing on 95 test scenarios and Beta Testing by a mathematics teacher with 17 years of experience. The test results showed that all scenarios were successfully executed with a success rate of 100%, while beta testing received an average score of 4.71 in the material aspect and 4.71 in the media aspect. The results indicate that the developed website has functioned well and is suitable for use as a learning medium for spatial structures.
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