Question

Can Someone Please Help Me with some Geometry??

Answer 1

For these 3 pictures.. i need to find the surface area

Answer 2

the first one is composed of
2 triangles: 4x5 + 4x5 = 40m
3 rectangles: 4x14 + 5x14 + \[14\times \sqrt{4^{2} + 5^{2}}\]
and you add all of them up

Answer 3

so the first one would be 89.64?

Answer 4

Area of triangle is BH/2, in this figure that equals (4 x 5)/2=20/2=10 sq M, but their are two so the surface area of the triangular portion would be 20 sq meter.

Answer 5

for the first one i got 2(20)+Ph.. i need to find out what the perimeter is

Answer 6

The suface of the sides are as indicated by tacolover. 5x14= 70 sq M for one side. 4x14=56 sqM for another side and 14 x sq rt(16+25)
\[\sqrt{41}\times14\]

Answer 7

im totally lost... the formula i have to use is 2B+Ph

Answer 8

Final answer is: 10+10+70+56+89.6=235sq M

Answer 9

so that would be for the first one?

Answer 10

That will work too

Answer 11

yes as long as you remember that the B is a triangle and their are two of them.

Answer 12

P is perimeter and you must user all three sides.

Answer 13

You want to look at the next figure?

Answer 14

yeah.. so far for the next one i got 2(28)+Ph

Answer 15

It is a cylinder or like a can. Too find the total surface area you calculate the area of the ends which are circles (don't forget their are two of them. Then the body is actually a rectangle which has one side equal to the circumference of the circle times the height.

Answer 16

Do you agree?

Answer 17

yeah.. sorry for some reason i put up the wrong picture.. but i need help with that one to

Answer 18

so id use 2*pi*r^2+2*pi*r*h

Answer 19

Do you know how calculate the area of circle whose diameter is 8cm or radius would be 1/2 of that or 4 cm.??

Answer 20

The area of the ends would be as you have but it would be like 2(2*pi*r^2).

Then the can (not the ends) would be h*C

8*piD=8*pi*8

Answer 21

I am sorry I got the area wrong for the ends. The formula is pi*r^2 so the ends would be 2(pi*r^2) that is for both ends

Answer 22

so for r would it be half the diameter (8).. so 2(3.14*4^2)

Answer 23

Yes that gives you the area for the ends of the cylinder. both

Answer 24

so 100.48

Answer 25

Let me check yes for the ends. Now this must be added to the surface area of the body of the can pi*D*h

Answer 26

so 3.14*8*12=301.44

Answer 27

Right now add the end area to your 301.44

Answer 28

than i would add 100.48+301.44=401.92

Answer 29

Yes that would give you the total surface area of the can, I forgot that the heigth was 12 and put 8 but you caught it!

Answer 30

and that is in sq cm

Answer 31

okay

Answer 32

Do you need any help on the 3rd figure.

Answer 33

no but will you check this one for me

Answer 34

i got 326.25m^2

Answer 35

Does it have a bottom and a top? It is hard to tell from the drawing!

Answer 36

yea

Answer 37

I used calculator and got 326.73, so I would say you used the correct procedure and don't forget what the units are.......sq M

Answer 38

ok thank you

Answer 39

can you also check this one.. i got 254.34 ft^2

Answer 40

I agree with your answer of 254.34 sq ft.