พื้นผิว, บรรจบ, เส้น, ทางเรขาคณิต, บั้งยศ, เส้นทแยงมุม, มุม, ทิศทาง, ซ้าย, ขวา, ขึ้น
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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