25 lines
489 B
C
25 lines
489 B
C
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#ifndef triangle_h
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#define triangle_h
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#include <stdlib.h>
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#include <math.h>
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#include "shape.h"
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double triangleArea(Shape* triangle) {
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double side = triangle->perimeter / 3;
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double area = (sqrt(3) / 4) * (side * side);
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return area;
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}
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Shape* newTriangle(double perimeter) {
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Shape* triangle = malloc(sizeof(Shape));
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triangle->numSides = 4;
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triangle->perimeter = perimeter;
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triangle->area = triangleArea;
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return triangle;
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}
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#endif
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