Yailynn565
29.04.2021 •
Mathematics
I have a 100ft ladder that just touches a 10ftx10ftx10ft cube/box against the wall. How high does the ladder reach up the wall?
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Ответ:
756π cm^3.
Step-by-step explanation:
Volume of the cone
270π = 1/3 π r^2 h
270π = 1/3 π r^2 * 10
r^2 = 270 / ( 10/3 )
r^2 = 81
r = 9 cm.
So the volume of the hemisphere = 1/2 * 4/3 * π * 9^3
= 486π cm^3.
So the volume of the whole solid = 270π + 486π
= 756 π cm^3.