The volume of the pyramid shown in the figure is 9,15,21, or 63 cubic centimeters. If the slant height of the pyramid increases by 4 centimeters and its height increases by 2 centimeters, the volume of the pyramid increases by 6,9,12 or 21 cubic centimeters.

The volume of the pyramid shown in the figure is 91521 or 63 cubic centimeters If the slant height of the pyramid increases by 4 centimeters and its height incr class=

Respuesta :

[tex]\bf \textit{volume of a pyramid}\\\\ V=\cfrac{1}{3}Bh\qquad \begin{cases} B=base\\ h=height\\ ----------\\ B=width\cdot length\\ length=3\qquad width=3\\ B=3\cdot 3=9\\ h=5 \end{cases}\\\\ -----------------------------\\\\ \textit{what if we increase the slant height by 4 and height by 2?} \\\\\\ V=\cfrac{1}{3}Bh\qquad \begin{cases} B=width\cdot length\\ length=3\qquad width=3\\ B=3\cdot 3=9\\ h=7 \end{cases}[/tex]

the slant-height plays no role on that equation to get the volume, only the height does, and the Base, so the slant-height going from 7 to 11, has no bearing on the volume, since we know the height

[tex]\bf V=\cfrac{1}{3}\cdot 9\cdot 5\implies V=3\cdot 5\implies V=15 \\\\\\ V=\cfrac{1}{3}\cdot 9\cdot 7\implies V=3\cdot 7\implies V=21[/tex]

so hmmm, it was 15, then it went up to 21, 21-15 = 6, went up by 6 units

the answer is 15 and 6