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anonymous · Answer

attachment

anonymous · Answer

what do you want dear?

anonymous · Answer

to get the lateral surface area. can you help me?

anonymous · Answer

sorry but I cannot get what it is...=((

anonymous · Answer

i will send more picture

anonymous · Answer

attachment

anonymous · Answer

it is a rectangular prism right?

anonymous · Answer

I think you're right but I have no idea how we can find the answer=(

anonymous · Answer

oh.. :(( nah it's okay. thank you :)

anonymous · Answer

my problem is the triangles of the both sides...

anonymous · Answer

why is that?

callisto · Answer

lateral surface area =?

anonymous · Answer

yeah

callisto · Answer

lateral surface area = 3.5*16.4*2 + $$\sqrt{s(s-2)(s-16.4)(s-16.4)}*2$$ where s = (16.4+16.4+2)/2
 = 114.8+32.73907 = 147.5, cor to 1d.p.

anonymous · Answer

sorry I lost the connection to the internet suddenly.my problem was that the height I found for the triangles was not good.(I don't know the exact english word for this kind of number:((sqrt((16.4)^2 -1))

callisto · Answer

$$\sqrt{s(s-2)(s-16.4)(s-16.4)}$$ is actually heron's formula, you can use it to find the area of triangle if you know all the 3 sides of the triangle

callisto · Answer

Problem solved?

anonymous · Answer

what is "cor to 1 d.p"?

anonymous · Answer

I really enjoyed your answer!!!=)

callisto · Answer

correct to 1 decimal place

callisto · Answer

you need to round the figure, right?

anonymous · Answer

yeah

callisto · Answer

up tp ? what decimal place or significant figures?

anonymous · Answer

that is a rectangular prism right?

callisto · Answer

nope

anonymous · Answer

so what is it?

callisto · Answer

dunno lol

callisto · Answer

sorry what i can help for this question is calculation only :(

anonymous · Answer

oh. hmmm. i dont get you asnwer , confusing, i used sci, calcu. i got 156

callisto · Answer

s=(16.4*2+2)/2 = 34.8/2=17.4
so the things inside the root = 17.4(17.4-2)(17.4-16.4)(17.4-16.4) =267.96
after taking the root , it is 16.3694838

callisto · Answer

when it is times 2, it becomes 32.73896761, then add it to 3.5*16.4*2 (=114.8) 
= 147.5389676

anonymous · Answer

$$s = a+b+c / 2$$ why your s = a*b+2)/2???

callisto · Answer

sorry typing mistake but the answer is correct

anonymous · Answer

i dont think so,  s= 16.4+2+2 / 2 = 10.2 ?? is that right?

anonymous · Answer

you use multiplication instead of addition,???

callisto · Answer

please, i do add a blanket to it

callisto · Answer

you need to add 16.4 +16.4 +2 first
then the answer is divided by 2

anonymous · Answer

oh.. i get it

callisto · Answer

be careful when you read the solution and never miss out the bracket, sorry i did make a spelling mistake on the word'bracket' just now

anonymous · Answer

okay,,thank you so much . how about the volume of that object ?

callisto · Answer

height of the triangle shown = $$\sqrt{16.4^{2}-(2/2)^{2}}$$$$=\sqrt{267.96}$$
area of the triangle shown = 2*height /2 $$=\sqrt{267.96}$$
volume required = area of triangle *3.5 $$=\sqrt{267.96}*3.5=57.3$$

callisto · Answer

you didn't askk the volume in your question actually

callisto · Answer

*ask

anonymous · Answer

what question?

callisto · Answer

this question , you just asked the lateral surface area not the volume

anonymous · Answer

oh. yes.

anonymous · Answer

what formula did you used for the volume?

callisto · Answer

can hardly tell, like normal prism, but the base just changed to the triangle because you can divide it evenly with horizontal when the base is a triangle lol

callisto · Answer

where's the response =.=?

anonymous · Answer

wrong question , i get confused. ahmm, back at the LSA why do we have to 
					      16.3694838cm2 x 2
					       = 32.73896761cm2