Presentation

TI-92

angles in a triangle (up and down)

By moving point A, how can you make angle A smaller? What will happen to the other two angles then?[br][br]When using the arrow keys in the keyboard (click A and press the keys), you may restrict the movement of A in 4 directions. In particular, you can keep pressing a key to move A upwards, even when it goes outside the window. How will the size of angle A change? Can you estimate its size even when the vertex A is hidden above the viewing window? (Use the check box the hide or show its measurement when trying this estimation.) [br][br]You may also hide all angles during this exploration and estimation.
This is a task in a collection about [url=https://ggbm.at/nh3y2vQf]angles of triangle[/url].
Here is a quick demo.

maximum cone

Drag B to change the angle of the sector. Observe the change in the volume of the cone.

Migrating from PCK to TPACK

More information:[url] www.tpack.org[/url] Beautifully structured article: [url]http://www.citejournal.org/vol9/iss1/mathematics/article1.cfm[/url]

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