volume(semi cone)
volume(quarter sphere)
volume(diabolo)
The volume under this hipped roof belongs to a solid consisting of a triangular prism (put onto its side) with two semi pyramids (that you can combine into one pyramid) on both sides. Its volume therefore is: m3.
The base is composed of five isosceles triangles with a top angle of 72°, a base length
of cm, two sides of and a height of . The area of the pentagon is therefore cm2.
The height of this regular five-sided pyramid is then cm.
The volume of the figure is therefore cm3.
(Mentally) saw through the pipe at the seam of the right-angled bend. Twist to straighten
the pipe, as shown in the figure. The amount of steel (assuming there is no hole in
the base plate) then becomes: mm3.
That is cm3. The whole construction therefore weighs gram.
volume m3