What other formulas can be used in high school mathematics but have not been learned ~ For example, using Helen's formula to solve S△ - Training Enrollment Network

What other formulas can be used in high school mathematics but have not been learned ~ For example, using Helen's formula to solve S△

I've learned it.

p*(p-a)*(p-b)*(p-c)

I learned this in grade three.

A

B

C

be

Three sides of a triangle

P is

Sum of three sides times 1/2.

No matter how much, it's useless.

And the calculation is easy to make mistakes.

It is not recommended for the exam.

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