ar of circular shell iner 8 cm & outer radi12cm is = to the totl surface ar of a cylinderof radius R1 Answer options: a. 30 - R1/ r1 sq B) 40- R1sq/R1 (c) 3 R1sq - 3- / 7 R1 D) R1sq-40/R1sq
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?????????????? yu gonna oenlee yuze the SIDE area av the cylinder ?????????? . . side area av cylinder=rim-leng*leng (or hite if it stand up) . . . rim leng=2pi*radius . . . yer 2 shells hav side area av 2pi*(8+12)=20*2pi . . . raesheo av area av 2 shells tu cylinder=40pi/2piR . . . =20/R
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