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problem 213 mathcounts

Mathematics
Tutor: None Selected Time limit: 0 Hours

In the Mexican jungle, an archaeologist finds a right square pyramid with a base edge length of 60 yards. The pyramid has lateral edge length 50 yards. In square feet, what is the total surface area of the lateral faces of the pyramid?

Sep 14th, 2014

Surface area of pyramid=4*surface area of each triangle

Each triangle has a base of 60 yards

And height of √(502-302)=40yards

Area of each triangle=0.5*60*40=1200 yard2

Therefore area of pyramid=4*1200=4800yards2=4800*(3)2=43200 ft2


Sep 14th, 2014

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Sep 14th, 2014
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Sep 14th, 2014
Dec 9th, 2016
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