anonymous
  • anonymous
Can someone please please help me with some more surface area of pyramids and cones???
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
maybe i might be able to help little bit maybe
anonymous
  • anonymous
take a screen shot of problem and upload it
anonymous
  • anonymous
for this one i need to find the slant hight, lateral area, and the surface area
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anonymous
  • anonymous
for this one i need to find the slant height
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anonymous
  • anonymous
okay hold on sec
anonymous
  • anonymous
okay on the slant height you use this formula =Lateral Area of a regular pyramid: ½ perimeter × slant height = 96 on this one
anonymous
  • anonymous
because see tha base of it is got dotted line which means you take half of 16 = 8 and * that by 12 which gives us 96
anonymous
  • anonymous
on frist one to get surface area use this formula Surface Area = Lateral Area + n × Bases.
anonymous
  • anonymous
i should of put this at the top... they are multiple choice.. for the cone the choices are a) 20 b) 10.6 C08.9 d) 14.4 e)7.1
anonymous
  • anonymous
well hummmmmmmm
anonymous
  • anonymous
yeah sorry im trying to do like 5 things at once
anonymous
  • anonymous
all good i am trying to do my math work and help others
anonymous
  • anonymous
lol
anonymous
  • anonymous
(25/4+144/4)^(1/2) = (169/4)^(1/2) = 13/2 (169/4+25/4)^(1/2) = 6.96 for side of pyramid
anonymous
  • anonymous
6.96 for side of pyramid so would this be the slant height?
anonymous
  • anonymous
?, the side going from one of the bottom corners to the top.
anonymous
  • anonymous
It's the longest side on the pyramid
anonymous
  • anonymous
for the pyramid: the slant height choices are: a)4.5cm b)5.5cm c)6.5cm d)6cm e)7.8 for the lateral area choices are: a)57.5cm^2 b)65cm^2 c)32.5cm^2 d)78cm^2 e)90cm^2 for the surface area: a)57.5cm^2 b)65cm^2 c)32.5cm^2 d)78cm^2 e)90cm^2
anonymous
  • anonymous
Ok, slant height is the height from the midpoint on the base to the top. So 6.5
anonymous
  • anonymous
for SA, .5bh*4 + b^2 b=5, h=6.5 (5)(6.5)(2)+5(5) 90cm squared
anonymous
  • anonymous
I'm guessing lateral area means without the base, so it's probably 65
anonymous
  • anonymous
All you need to know to do these problems to use the Pythagorean theorem on Right triangles to find the missing side, and area of triangles is simply .5base times height.
anonymous
  • anonymous
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