17 lines
524 B
C++
17 lines
524 B
C++
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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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//求三条边的长度，然后再用海伦公式进行求解
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double a, b, c;
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cin >> a >> b >> c;
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double p = (a + b + c) / 2;
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//假设在平面内,有一个三角形,边长分别为a、b、c
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//三角形的面积S可由以下公式求得：
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//S=√[p(p-a)(p-b)(p-c)]
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//而公式里的p为半周长：p=(a+b+c)/2
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cout << fixed << setprecision(1) << sqrt(p * (p - a) * (p - b) * (p - c)) << endl;
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return 0;
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}
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