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area of a prism is the sum of the area of each of the 6 sides
what does p = 20" refer too?
i think its the perimeter
oops this is not a regular prism. the area is still the sum of all the "faces' of the prism
oh yes - OK
surface area = 2*area of pentagon face + perimeter of pentagon face* height
area of the pentagon = 5 * area of each isosceles triangle with height k and base = p/5 = 20/5 = 4 = 5* k * 1/2 * 4
and the area of each lateral is 6*4
yes thats the length of each side of the pentagon
as tricial said you can find the area of all the lateral part by multiplying perimeter of pentagon by 6 = 20 * 6
do't forget you have 2 pentagons
whats the answer?
the area is 2 * 5* k * 1/2 * 4 + 20* 6 all you need do is simplify
you've forgotten to include the k
240 is the lateral area only
No you need to work out the first term 2 * 5 * k * 1/2 * 4 = ?
if you prefer work out the numbers on your calculator then put k on the end
this is the area of the 2 pentagons
no like 235k but the number isn't 235
the calculator says 0
2*5*(1/2)*4 is not 0
2*5 = 10 10 * 1/2 = 5 5 * 4 = ?
right so now it 20 * k + 240 = 20k + 240
the question required TA in terms of k and there it is.
are you sure?
yes the answer is 20k + 240