Question

The area of the base of a prism is 21 cm2. The perimeter of the base is 20 cm. The height of the prism is 8 cm.

What is the surface area of the prism?

Answer 1

@dan815
@♪Chibiterasu

Answer 2

@satellite73 @SolomonZelman @Miracrown @micahm @UsukiDoll @Astrophysics

Answer 3

can some one help me

Answer 4

openstudy.com/updates/54e4ad6ce4b0aba126e81022


copy and paste this in a new window

Answer 5

you do not know the shape of the base but you do knw the perimeter

when you make the base int a prism you end up with a number of rectagular sides

the height of EACH of these rectangles is 8 and the summ of ALL their widths is 20

so - what isa the area of all the side faces?

Answer 6

i already saw that it doesn't help

Answer 7

@micahm

Answer 8

https://www.google.com/search?q=The+area+of+the+base+of+a+prism+is+21+cm2.+The+perimeter+of+the+base+is+20+cm.+The+height+of+the+prism+is+8+cm.+What+is+the+surface+area+of+the+prism%3F&rlz=1C1GGGE___US571US573&oq=The+area+of+the+base+of+a+prism+is+21+cm2.+The+perimeter+of+the+base+is+20+cm.+The+height+of+the+prism+is+8+cm.+What+is+the+surface+area+of+the+prism%3F&aqs=chrome..69i57&sourceid=chrome&es_sm=122&ie=UTF-8#q=The+area+of+the+base+of+a+prism+is+21+cm+2.+The+perimeter+of+the+base+is+20+cm.+The+height+of+the+prism+is+8+cm.+What+is+the+surface+area+of+the+prism?

Answer 9

i know that but don't know how to get the answer

Answer 10

you have a number of rectangular vertical faces the sum of their bases is 20, and ALL have a height of 8

so what is their area?