male engineer working at desk with a laptop, holding a miniature wind turbine model, exploring sustainable alternative power solutions for a greener future. - 數學函數 個照片及圖片檔
white geometric fractal triangle pattern on a light gray background with repeating smaller triangular cutouts and subtle shadowed edges. - 數學函數 幅插畫檔、美工圖案、卡通及圖標
clean energy investors / sustainable energy solution development. esg business concept. - 數學函數 個照片及圖片檔
clean energy investors / sustainable energy solution development. esg business concept. - 數學函數 個照片及圖片檔
City utility workers clean up after a Russian guided bomb attack on July 1, 2026 in Kharkiv, Ukraine. Russian forces struck Kharkiv with seven guided...
Rescuers take a break while working at the site of a Russian strike on a residential district on May 24, 2026 in Kyiv, Ukraine. Ukrainian President...
Soldier of 505th Marine Battalion adjusts a ground drone "Targan 200" in the Novopavlivka direction on April 1, 2026 in Unspecified, Ukraine. In...
old engraving illustration of crystal twinning, two or more adjacent crystals of the same mineral are oriented so that they share some of the same crystal lattice points in a symmetrical manner - 數學函數 個照片及圖片檔
old engraved illustration of the tangent line or tangent (in geometry) to a plane curve at a given point is, intuitively, the straight line that "just touches" the curve at that point - 數學函數 個照片及圖片檔
old engraved illustration of geometric figure, trapezoid (a four-sided, flat geometric figure (quadrilateral) with at least one pair of parallel sides, known as bases, and two non-parallel sides called legs) - 數學函數 個照片及圖片檔
function - handwritten text, highlighted, crossed out, underlined on blank background - 數學函數 幅插畫檔、美工圖案、卡通及圖標
old engraving illustration of the cubic (or isometric) crystal system, characterized by high symmetry, featuring three equal axes intersecting at angles - 數學函數 個照片及圖片檔
old engraving illustration of hemimorphism, a crystallographic property where a crystal possesses different terminal faces at opposite ends of a single axis due to a lack of center symmetry - 數學函數 個照片及圖片檔
old engraving illustration of the tetragonal crystal system, one of the seven crystal systems - 數學函數 個照片及圖片檔
old engraving illustration of hemimorphism, a crystallographic property where a crystal possesses different terminal faces at opposite ends of a single axis due to a lack of center symmetry - 數學函數 個照片及圖片檔
old engraving illustration of a regular dodecahedron or pentagonal dodecahedron, a dodecahedron (a polyhedron with 12 faces) composed of regular pentagonal faces, three meeting at each vertex - 數學函數 個照片及圖片檔
old engraving illustration of the tesseral (or regular) system refers to a crystallographic or geometric framework based on an isometric system, characterized by three equal axes intersecting at right angles (cubic symmetry) - 數學函數 個照片及圖片檔
old engraving illustration of a regular dodecahedron or pentagonal dodecahedron, a dodecahedron (a polyhedron with 12 faces) composed of regular pentagonal faces, three meeting at each vertex - 數學函數 個照片及圖片檔
old engraving illustration of the triclinic (or anorthic) crystal system, one of the seven crystal systems - 數學函數 個照片及圖片檔
old engraving illustration of a regular tetrahedron, a polyhedron with four equilateral triangular faces - 數學函數 個照片及圖片檔
old engraving illustration of a pentakis dodecahedron or kisdodecahedron, a polyhedron created by attaching a pentagonal pyramid to each face of a regular dodecahedron - 數學函數 個照片及圖片檔
old engraving illustration of two tetrahedra (triangular pyramid) combine into an octahedron (a polyhedron with eight faces) - 數學函數 個照片及圖片檔
old engraving illustration of a regular tetrahedron, a polyhedron with four equilateral triangular faces - 數學函數 個照片及圖片檔
old engraving illustration of the monoclinic crystal system is one of the seven crystal systems - they form a parallelogram prism - 數學函數 個照片及圖片檔
old engraving illustration of the orthorhombic crystal system, one of the seven crystal systems - 數學函數 個照片及圖片檔
old engraving illustration of the hexagonal crystal system, characterized by a single 6-fold rotation axis, often featuring prisms, dipyramids, and pyramids with 6-fold (hexagonal) or 3-fold (trigonal) symmetry - 數學函數 個照片及圖片檔幾何圖形, 舊的, 冰之結晶
