Question: What was the total surface area of the supercontinent where Tritheledontids have lived ?
Context: The Tritheledontidae or tritheledontids, also known as ictidosaurs, were small to medium-sized (about 10 or 20 cm long) cynodonts.  They were extremely mammal-like, highly specialized cynodonts, although they still retained a very few reptilian anatomical traits.  Tritheledontids were mainly carnivorous or insectivorous, though some species may have developed omnivorous traits.  Their skeletons show that they had a close relationship to mammals. Tritheledontids or their closest relatives may have given rise to primitive mammals.  The tritheledontids were one of the longest lived non-mammalian therapsid lineages, living from late Triassic to the Jurassic period.  Tritheledontids became extinct in the Jurassic period, possibly due to competition with prehistoric mammals such as the triconodonts.  They are known from finds in South America and South Africa, indicating that they may have lived only on the supercontinent of Gondwana.  The family Tritheledontidae was named by South African paleontologist Robert Broom in 1912.  The family is often misspelled "Trithelodontidae". The following is a list of lakes in Ohio.  According to the Ohio Department of Natural Resources, there are approximately 50,000 lakes and small ponds in the U.S. state of Ohio, with a total surface area of about 200,000 acre .  About 2,200 of these lakes are 5 acre or greater, with a total surface area of 134,000 acre .  These 2,200 include both public and private lakes.  The United States Environmental Protection Agency estimated (from an electronic file generated from 1:100,000 scale maps) that Ohio has 5,130 lakes totaling 188,461 acre .  The difference in the number of lakes estimated by USEPA and ODNR is likely related to numerous small ponds (high number, small acreage) not detected on the 1:100,000 scale maps. Lake Mistassini (in French: "Lac Mistassini") is the largest natural lake by surface area in the province of Quebec, Canada, with a total surface area of approximately 2,335 km² and a net area (water surface area only) of 2,164 km².  It is located in the Jamésie region of the province, approximately 360 km east of James Bay.  The Cree town of Mistissini is located on Watson Peninsula in the south-east corner of the lake, which separates Baie du Poste from Abatagouche Bay. Specific surface area (SSA) is a property of solids defined as the total surface area of a material per unit of mass, (with units of m/kg or m/g) or solid or bulk volume (units of m/m or m). Brunauer–Emmett–Teller (BET) theory aims to explain the physical adsorption of gas molecules on a solid surface and serves as the basis for an important analysis technique for the measurement of the specific surface area of materials.  In 1938, Stephen Brunauer, Paul Hugh Emmett, and Edward Teller published the first article about the BET theory in the Journal of the American Chemical Society.  The BET theory applies to systems of multilayer adsorption and usually utilizes probing gases that do not chemically react with material surfaces as adsorbates to quantify specific surface area.  Nitrogen is the most commonly employed gaseous adsorbate used for surface probing by BET methods.  For this reason, standard BET analysis is most often conducted at the boiling temperature of N (77 K).  Further probing adsorbates are also utilized, albeit with lower frequency, allowing the measurement of surface area at different temperatures and measurement scales.  These have included argon, carbon dioxide, and water.  Specific surface area is a scale-dependent property, with no single true value of specific surface area definable, and thus quantities of specific surface area determined through BET theory may depend on the adsorbate molecule utilized and its adsorption cross section. Gondwana ( ), or Gondwanaland, was a supercontinent that formed from the unification of several cratons in the Late Neoproterozoic, merged with Laurussia in the Carboniferous to form Pangaea, and began to fragment in the Mesozoic.  It was the largest continental landmass on Earth, covering an area of 1000000 km2 or 64% of today's continents.  Located in the Southern Hemisphere, it incorporated several modern landmasses, including Antarctica, South America, Africa, Madagascar, and Australia, as well as the Arabian Peninsula and the Indian subcontinent, which have now moved entirely into the Northern Hemisphere. Air cooling is a method of dissipating heat.  It works by expanding the surface area of or increasing the flow of air over the object to be cooled, or both.  An example of the former is to add cooling fins to the surface of the object, either by making them integral or by attaching them tightly to the object's surface (to ensure efficient heat transfer).  In the case of the latter, it is done by using a fan blowing air into or onto the object one wants to cool.  The addition of fins to a heat sink increases its total surface area, resulting in greater cooling effectiveness. The Swiss Vapeur Parc is a miniature park in Le Bouveret, a village on Lac Léman, Switzerland.  It was opened on June 6, 1989, by an International Festival of Steam (therefore steam trains).  When the park opened its total surface area was 9000 m² (2.2 acres), but the park expanded and as of 2007, the park covers a surface area of 17'000 m² (or 4.2 acres).  In 1989, the park possessed only 2 locomotives (one running on benzine and one on steam).  As of 2007, the number of trains running on benzine has sextupled while the number of steam trains has increased to 9 trains.  By March 31, 2007, the Park has had 2'126'000 visitors. Natural lakes in Bosnia and Herzegovina take 67.5 km², which is a little more than 0.12% of the total surface area of Bosnia and Herzegovina.  Buško Blato is the largest lake, its size being 56.7 km².  Blidinje lake is the largest natural mountain lake in Bosnia and Herzegovina, with surface area varying between 2.5 and 6 km², and Buško Blato lake with its size of 56.7 km² is the biggest artificial accumulation in Bosnia and Herzegovina; however it is forgotten that this lake was made from accumulation of water from the Buško Blato marshland, earlier natural slough and morass system.  The total size of all lakes is 1/10 as large as the world average.  Because of this, natural lakes in Bosnia and Herzegovina are not economically important. The surface area of a solid object is a measure of the total area that the surface of the object occupies.  The mathematical definition of surface area in the presence of curved surfaces is considerably more involved than the definition of arc length of one-dimensional curves, or of the surface area for polyhedra (i.e., objects with flat polygonal faces), for which the surface area is the sum of the areas of its faces.  Smooth surfaces, such as a sphere, are assigned surface area using their representation as parametric surfaces.  This definition of surface area is based on methods of infinitesimal calculus and involves partial derivatives and double integration.
Answer: 1000000 km2