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Level 20
Author:
Colin Beveridge
Level 20 of
http://euclidthegame.org/Level20.html
asks you to construct the outer tangent to two given circles (here, a, with centre A; and b, with centre B). Here's how I'd do it.
GeoGebra
New Resources
Poorly Drawn Parallelograms 3
Finding Average Rate of Change of a Function
Exploring the Derivative of a Quadratic Function
Icosahedron1
Average Rate of Change: Graph a Function (2)
Discover Resources
endPointsIntervals2
CT4: Angles in a Cyclic Quadrilateral
Directions for Activity
พื้นที่ในปริภูมิสามมิติ
דלתון3
Discover Topics
Means
Vectors 3D (Three-Dimensional)
Triangles
Expected Value
Variance