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Angle marks for triangle congruence
Design Concept 設計理念 使用扣條進行三角形全等教學時的擴充教具， 可以指示角度，進行SAS與ASA的演示 This extension tool is designed for teaching triangle congruence using fasteners. It can indicate angles and demonstrate the SAS (Side-Angle-Side) and ASA (Angle-Side-Angle)…
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