Jewellery Stand

7th grade math question?

this is not homework i had a math test and everything went PERFECT except i could not get this last question i mean it was hard so i had a spare peice of paper and decided to write it down and maybe later i could see what i did wrong (no i am not planning to change my answer) but the question is.... Nancy made a cylindrical jewelry holder for her dresser she covered 1 base and the side with silver paper if the holder was 12 cm. tall and 14 cm wide, about how much silver paper did nacy use. ( use pi=3 ) A. 651 cm B. 500 cm C. 800 cm D. 750 cm the formula for surface area of a cylinder is S=2B+Ph i put A. what do u think it is... im in acc. math

Public Comments

1. your right
2. B 500
3. Hmmm..... I got the A too. Maybe your teacher screwed up?
4. Total surface area 798cm^3 minus 1 base 798 cm^3 - 147 = 651 u r correct
5. circumfrance of circle = Pixd = 3x14 12x42= 504 cm2 = area of cylinder One base is a circle. r=7 area of circle = 3x7^2=147cm2 504+147 = 651. You got it right!!
6. You're right it's A Side: 14x3=42 42x12=504 Base: 7x7=49 49x3=147 147+504=651
7. S=2B+Ph = 2πr (r + h) = 2(3)(14/2)(14/2 + 12) cm^2 = 798 cm^2 = nearly 800 cm^2