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Mathematics 10 Online
OpenStudy (anonymous):

A conical tent made of canvas has a base that is 20 feet across and a slant height of 14 feet. To the nearest whole unit, what is the area of the canvas, including the floor? Use 3.14 for p. A. 754 ft2 B. 1,193 ft2 C. 2,135 ft2 D. 534 ft2

OpenStudy (eyust707):

|dw:1342905184945:dw|

OpenStudy (anonymous):

in other words, the question is asking for the entire surface are: \[SA = Pi(rs) + Pi(r ^{2})\] where s is the slant height and r the radius, substitute and simplify

OpenStudy (eyust707):

|dw:1342905220412:dw|

OpenStudy (eyust707):

|dw:1342905269911:dw|

OpenStudy (anonymous):

@lykjpc

OpenStudy (eyust707):

\[Surface \space area \space of \space a \space cone = \pi *r*(Slant \space height) + \pi * r^2\]

OpenStudy (eyust707):

r is 1/2 of the diameter

OpenStudy (eyust707):

which would be 1/2 of 20

OpenStudy (eyust707):

so r = 10

OpenStudy (anonymous):

@eyust707 continue

OpenStudy (eyust707):

so just plug in the numbers to the equation i posted

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