#include <stdio.h>
int main() {
float side1, side2, height, area;
scanf("%f", &side1
); // get first side
scanf("%f", &side2
); // get second side
scanf("%f", &height
); // get height
area = 0.5 * height * (side1 + side2); // 0.5 * Height * (Sum of opposite sides)
return 0;
}
// Sawan Khwannet M.6/2 No.23
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