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รูปคลี่พีระมิด
Author:
Chompoonut
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G_11.06 Lengths in intersecting chords, secants, and tangents
Spring around torus
A2_6.03 Trigonometric identities
G_8.07 Area of triangles
Action/Consequence: Proving Parallelograms
Discover Resources
pythagorean thm
Rotation p4
Act 8 Rotations - Arrow
圖2：分割法(2個圖)
Molly Endyke - Isosceles Trapezoid
Discover Topics
Cosine
Complex Numbers
Multiplication
Parallelogram
Cylinder