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Problems with malloc

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Can somebody please take a look at this. When I run it, and I try to get sizeof(WorldData) I get 4 as a result. On the other hand dwNumTriangles*sizeof(TRIANGLE) seems to be evaluating to the correct answer.
	float x, y, z;
	float tu, tv;


typedef struct tagTRIANGLE
	CUSTOMVERTEX points[3];

TRIANGLE * WorldData = NULL;
DWORD dwNumTriangles = 36;

WorldData = (TRIANGLE*)malloc(dwNumTriangles*sizeof(TRIANGLE));  
If anybody has any idea why it''s not giving me the correct answer, it would be appreciated if you could tell me why. Thanks in advance

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If that''s the case, then how would I go about finding the size in bytes of the entire WorldData array?

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