The exact same as the original triangle.
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If the base stays the same, the area is also doubled.
If the sides of a triangle are doubled then the area becomes quadrupled (four times as large).
the area of a triangle is half of the base times the height the area of a triangle is half of the base times the height
As area_of_parallelogram = base x height if they are both doubled then: new_area = (2 x base) x (2 x height) = 4 x (base x height) = 4 x area_of_parallelogram Thus, if the base and height of a parallelogram are [both] doubled, the area is quadrupled.
The squared area of a triangle is half of its base times its perpendicular height. Or as: 0.5*base*perpendicular height = area of a triangle