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Total vocab geometry, please the line can do but not translate😅😅

2/12 Edited to

... Read moreหลายคนเจอคำว่า “parallelogram” ในโจทย์ geometry แล้วสะดุดเหมือนกันค่ะ เพราะหน้าตาคล้ายสี่เหลี่ยมหลายแบบมาก สรุปให้แบบจำง่ายๆ ก่อนเลย: parallelogram แปลว่า “สี่เหลี่ยมด้านขนาน” คือรูปสี่เหลี่ยมที่ “ด้านตรงข้ามขนานกันเป็นคู่ๆ” (มี 2 คู่) และมักมีสมบัติที่ใช้บ่อย เช่น ด้านตรงข้ามยาวเท่ากัน มุมตรงข้ามเท่ากัน และเส้นทแยงมุมตัดกันครึ่งหนึ่ง เพื่อไม่ให้สับสน เวลาอ่านโจทย์ลองแยกคำศัพท์กลุ่ม “รูปสี่เหลี่ยม” ออกเป็นหมวดๆ จะช่วยมากค่ะ 1) กลุ่มเส้นและมุม (พื้นฐานที่โจทย์ชอบใช้คำอังกฤษ) - Line = เส้นตรง - Ray = รังสี (มีจุดเริ่มต้นแล้วพุ่งไปทางเดียว) - Line segment = ส่วนของเส้นตรง (มีจุดปลาย 2 ด้าน) - Parallel lines = เส้นขนาน - Perpendicular = ตั้งฉาก - Acute angle = มุมแหลม (< 90°) - Right angle = มุมฉาก (90°) - Obtuse angle = มุมป้าน (> 90°) - Straight angle = มุมตรง (180°) - Reflex angle = มุมกลับ (> 180°) 2) กลุ่มรูปสามเหลี่ยมที่เจอบ่อย - Equilateral triangle = สามเหลี่ยมด้านเท่า - Isosceles triangle = สามเหลี่ยมหน้าจั่ว (สองด้านเท่า) - Scalene triangle = สามเหลี่ยมด้านไม่เท่า - Right triangle = สามเหลี่ยมมุมฉาก 3) กลุ่มรูปหลายเหลี่ยม (polygon) - Pentagon/Hexagon/Heptagon/Octagon/Decagon = ห้า/หก/เจ็ด/แปด/สิบเหลี่ยม 4) เปรียบเทียบ parallelogram กับสี่เหลี่ยมชนิดอื่น (จุดนี้ช่วยคลิกโจทย์ได้ไว) - Parallelogram = สี่เหลี่ยมด้านขนาน (ด้านตรงข้ามขนานกัน) - Rectangle = สี่เหลี่ยมผืนผ้า (มุมฉากทุกมุม) - Square = สี่เหลี่ยมจัตุรัส (มุมฉากทุกมุม + ด้านเท่ากัน) - Rhombus = สี่เหลี่ยมขนมเปียกปูน/สี่เหลี่ยมด้านเท่า (ทุกด้านเท่ากัน แต่ไม่จำเป็นต้องมุมฉาก) - Trapezoid = สี่เหลี่ยมคางหมู (มีด้านขนาน “อย่างน้อย” 1 คู่—บางตำรานิยามว่า “มีแค่ 1 คู่” ให้ดูตามที่ข้อสอบใช้) ทริคส่วนตัวเวลาเจอโจทย์ที่มีคำว่า parallelogram: ฉันจะรีบมองหา “เส้นขนาน” ก่อนเลย เพราะโจทย์มักให้มุมที่เกิดจากเส้นตัด (transversal) หรือให้ความยาวด้านตรงข้ามมา แล้วค่อยใช้สมบัติของสี่เหลี่ยมด้านขนานช่วยหาคำตอบ จะทำให้แปลโจทย์และตั้งสมการได้เร็วขึ้นค่ะ

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