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Just need to find the surface area of each semicircle part, and add 'em up. Or rather, two same semicircles make a circle! so, find out the are of a circle which has a diameter of '12in'. Then, add the area of the rectangular part --> 12x14 - right? What do you think now?
i did something way off ... but im not sure what i found the formula for a cylinder and i plugged in my numbers and calculated it and got 753.6 ....
it's not a cylinder! its like a lampshade kinda thing - two semicircular shades, and a rectangular background.
i know but if we added the other half... aha ... ok so what equation do i use?
find the area of the rectangular part, then are of each semi-circular shade and add em up!
ok the area of the rectangular part is 168 now i need to find the area of each semi-circular shade ... how do i do that?
sorry ive been working since 6 this morning non-stop... i dont think im trying as hard ... cuz this probably something i should get
its okay - i am woozy too :P. area of semi-circle = (1/2) area of circle plus you could think this way - two same semicircles make a circle, so just find the area of the the equivalent circle..
ok well i know the formula for the area of a circle is pi*r2 so since the diamiter is 12 the radius would be 6 plug that in and i got 113.04
uugh but adding those up gives me to big of a number hmmm
113 + 168 isn't right?
well it adds up to 281 which isnt one of my options
what are your options?
78π in2 84π in2 108π in2 120π in2
i am sorry, it's too late here, and i am too woozy - i misunderstood the whole thing - it must be a cylinder itself - i am really sure this time though. @Diyadiya will help you out. Thanks :) and apologies for misguiding - didn't mean it.
I got one answer :D
it's ok thanks for the help =) and ok =)
yeah would be -the last one - just help her understand.
First find the area of two semicircles area of semicircle = (pi * r^2)/2 =pi*(6)^2/2 =18pi 2 semicircles =18pi+18pi=36pi
did you understand til this ?
yeahh when we go to the semi circle stuff i think is when i started to get confused
Now its half of a cylinder
and i guess the rectangular part is open
You just have to find the lateral surface area of half of cylinder ( 2*pi*r*h) half cylinder so lateral surface area = 2*pi*r*h/2 =Pi*r*h can you do it?
yeahh i can do it thank-you =)
can you tell me the lateral surface area of it ?
take your time np
ok when i calculate 2*pi*r*h i got 263.76
don't take the value of pi .. just keep pi like that since your answer contains pi
so what will be the lateral surface area ?
ok so 2*r*h and my diamiter is 12 so radius would be 6 and height is 14 so 2*6*14 = 168pi?
Yes this is the lateral surface area of a cylinder but we have only half of a cylinder so divide it by 2
and add the area of 2 semicircles
ok so 84 plus the are of 2 semicircles
so what is it ?
i may have calcuulated that last part wrong