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Top math students in the new class of grade five
It depends on the region.

S triangle = base × height ÷2

S parallelogram = base × height

S square = side length × side length

S rectangle = length × width

S trapezoid = (upper bottom+lower bottom) × height ÷2

S circle = π× the square of radius

In the fifth grade of primary school, I learned parallelogram at most, and I may not even learn circle.

So just write so much.