ต่ำโพลี, รูปหลายเหลี่ยม, สามเหลี่ยม, บทคัดย่อ, ทางเรขาคณิต, เป็นแท่งปริซึม, รงค์, แบบแผน
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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