abdullaketbi71
27.02.2020 •
Mathematics
Simon Builds this podium on a platform.
What is the combined volume of the podium and the platform?
(Help me!) I just need help understanding how to do this type of thing! :)
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Ответ:
64 cubic feet
Step-by-step explanation:
You do this type of thing by dividing the figure into parts whose volumes are easy to figure.
This sort of figure offers several choices. We really only need to consider how to divide the front face into appropriate rectangles, since the depth of the figure is 2 feet everywhere. The volume is the area of the front face times that depth.
1) A 2 ft × 4 ft upright atop a 12 ft × 2 ft horizontal base. The frontal area is ...
(2 ft)(4 ft) +(12 ft)(2 ft) = 8 ft² +24 ft² = 32 ft²
so, the total volume is ...
V = frontal area × depth = (32 ft²)(2 ft) = 64 ft³
__
2) A vertical post of 2 ft × 6 ft at the left side with a horizontal protrusion of 10 ft × 2 ft from its bottom. The frontal area calculated this way is ...
(2 ft)(6 ft) +(10 ft)(2 ft) = 12 ft² +20 ft² = 32 ft² . . . . . as before
Again, the total volume is (32 ft²)(2 ft) = 64 ft³.
__
3) A 6 ft × 12 ft rectangle with a 4 ft × 10 ft cutout from the upper right corner. The area calculated this way is ...
(6 ft)(12 ft) -(4 ft)(10 ft) = 72 ft² -40 ft² = 32 ft² . . . . . same as above
Again, the total volume is (32 ft²)(2 ft) = 64 ft³.
Ответ:
x = 20 ; y= 10√3
Step-by-step explanation:
30, 60 , 90 triangle ratio is
Side opposite to 30 is a
a = AC = 10
Side opposite to 60 is a
AB = a = 10√3
Side opposite to 90 is 2a
BC = 2a = 2* 10 = 20