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圓上的角任務(一): 提示卡(四)
Author:
Stanley Mak
GeoGebra
New Resources
算柱 (兩位數)
四邉形 (四年級) 教師版
兩組對邊相等的四邊形
Nested spiral octagon
Fibonacci Clock
Discover Resources
內切圓滾動
Relationships among 3 Circle Theorems 三個圓定理的關係
光的折射（光线自右下向左上）
半圓柱(可改底面圓半徑、柱高)
兩圓位置關係
Discover Topics
Pyramid
Quadratic Equations
Cuboid
Cosine
Numbers