A triangle and a parallelogram are constructed on the same base such that their areas are equal. If the altitude of the parallelogram is 50 m, then what will be the altitude of the triangle?

Area topics are: Area of rectangles, squares, triangles, quadrilaterals, polygons, and circles.

Here are some area formulas for quantitative aptitude:
Rectangle: Area = (length x breadth)
Square: Area = (side)2 = (diagonal)2
Triangle: Area = x base x height
Parallelogram: Area = (base x height)
Circle: Area = R2, where R is the radius
Trapezoid: Area = 1⁄2 × (base + base) × height
Room walls: Area = 2 (length + breadth) x height
Circumference of a semi-circle: Circumference = R