The Greek mathematician Archimedes (c. 287-212 B.C.E.; Hellenic) also found a way to determine the area of a circle similar to the Chinese comb: a method he first recorded in his work, *Measurement of a Circle* (c. 225 B.C.E.). He also used a sequence of wedges to determine the area of a circle; as the number of wedges (or triangles) inside the circle increased toward infinity, they became infinitely thin. By giving each small triangle a base *(b,* a line connecting the points where the wedges touched the circle’s circumference), he determined that the area was ½ times the radius (r) times the base, summed over all the infinitesimal triangles (or sum (½) *rb*). Because they all had the same height, that was factored out. Thus, the area became (½)*r* (sum (*b*)) = 1/2*rc*, with *c* being the circumference, or the sum of the bases *(b)* of all the triangles (since the bases make up what is perceived as the circle’s circumference). This is interpreted as one half times the radius times the circumference (*c* = 2π*r*), which is the same as saying π*r*^{2}. (For more about Archimedes and his wedges, see “Mathematical Analysis.”)