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A trough is 12 feet long and 3 feet across the top (see figure). Its ends are isosceles triangles with altitudes of 3 feet.
![A Trough Is 12 Feet Long And 3 Feet Across The Top See Figure Its Ends Are Isosceles Triangles With Altitudes Of 3 Feet class=](https://us-static.z-dn.net/files/dc9/a1dcd8ff670a094bbe8a98e18299d816.png)