Area of a Triangle = Half of its Rectangle or Square

Area of a Triangle
[b]Let’s try something cool![/b] [br]Slide the button to the right. [br]Did you see that? [br]The pieces of our triangle just doubled themselves and fit perfectly together to form another shape.[br]What is that shape?
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– wootwoot, Jacob Orner, David T

Information: Area of a Triangle = Half of its Rectangle or Square