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A measuring jar.
A paper cup typically has three flat surfaces: the bottom, which is circular, and the two sides which are usually straight and flat. These surfaces are necessary for the cup to hold its shape and be able to stand upright.
One way to find the capacity of a teapot is to completely fill the teapot with water. Then, find the largest measuring cup you have. If the largest you have is a one cup measurer, then start filling up that cup and pooring out the water from the teapot into the cup. Once the cup is full, empty the water down the drain and keep a running tally of how many cups you are filling. Once you get to the end you will eventually have water that will not fill the cup completely. At this point you must use another measuring device, like a tablespoon and measure how many of those are remaining. You may have to estimate the last few drops of water.
Either milliliters (small teacup) or liters (large teacup).
Depth of cone = Radius of semicircle = 28/2 cm = 14 cm Circumference of the base of cone = Arc of semicircle = 0.5*pi*28 = 14*pi cm Therefore radius of base = 14*pi/(2*pi) = 7 cm Capacity = 1/3*pi*r2*h where r is the radius of the base of the cone. = 1/3*pi*72*14 = 718 cm3