It really depends on what is known about the cone. If you know the volume (v) then depth = 3*v/(pi*r^2). There is more than one way to measure, if all else fails use a ruler.
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you find the radius of a cone by the bottom of it or the round part
Three dimensional objects, such as a cone, do not have a perimeter in any meaningful way.
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
Measure the depth using a metric ruler!
Volume of a cone = 1/3*pi*radius2*height