So thickness of flange is measured at b minus t by 4 distance that means this is total b, this is t, so b minus t by 2 is this distance and middle of that is the b minus t by 4, t is the tw thickness of web, so at that position we find the thickness of the flange either capital T we mention as T of tf also we call tf also.
इसलिए flange की मोटाई को इस प्रकार नापा जाता है- b minus t by 4 दूरी। जिसका मतलब है, यह पूरा b है, यह t है। इसलिए b minus t by 2 यह दूरी है। और जिसके मध्य में b minus t by 4 है।