# Area of a Triangle interactive (cf parallelogram)

- Author:
- Mrs Rouse, Tim Brzezinski, rebecca.pariso

- Topic:
- Area, Parallelogram

Interact with the applet below for a few minutes.

*Be sure to move the***BIG BLACK VERTICES***of the triangle around each time***before you move the slider.****Questions:**1) What transformation(s) took place in the applet above? 2) How does the area of the

**yellow triangle**compare with the area of the

**pink triangle**? 3) What BIG FIGURE was formed each time the slider reached its end? 4) Justify why your answer to (1) is correct. 5) The

**original triangle**makes up

**what fractional part of BIGGER FIGURE FORMED?**6) Write a formula for the area of the original triangle based on your answer to (5).

How does the area of the yellow triangle compare with the area of the pink triangle?