<prompt> Rule of nine true is used to denote ?Depth of burnsof total body surface areaSeverity of burnsType of burn  <response>: Ans. is b i.e., of total body surface area Extent of burns The surface area burnt is more impoant than the degree of burn, in assessing prognosis of a given case. For example, a first degree burn over a wide area is more dangerous than a third degree burn over a limited area. For estimation of burn area, there is rule of 9 Wallaces formula :? In adults surface area is calculated by :? 9 for the head and neck. 9 for each upper limb. 9 for the front of each lower limb. 9 for the back of each lower limb. 9 for the front of the chest. 9 for the back of the chest. 9 for the front of the abdomen. 9 for the back of the abdomen. 1 for the genitalia. 