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What is the slant height of the pyramid to the nearest tenth?
19.0 mm
12.5 mm
15.5 mm
13.9 mm

Using Eulerâ€™s Formula (F + V = E + 2), find the number of faces.
Vertices: 16
Edges: 37
Faces: ?

F=23 i think

for the Euler's formula one

ok thanks!

so do i do 2*3.14*14?

i got 87 23/25?

|dw:1435442689088:dw|

can you show me how you got that answer?

14/3.14 = 4 72/157

is that right?

oh okay thanks !

could u please help me with my second question above?

im not sure on this one either :/
What is the surface area of the pyramid to the nearest whole number?
30 cm2
25 cm2
60 cm2
85 cm2

|dw:1435443114081:dw|

whats the pythagorean theorem?

|dw:1435443244024:dw|

oh a^2+b^2=c^2?

yeah

i got 156 1/4

remember to take the square root at the end

244414 1/16?

square root, not square

|dw:1435443406104:dw|

\[\sqrt{?} this on a an\]

yes

on a and b and c?

220.9708691?

square root
slant height^2 = 156.25
slant height = square root of 156.25

12 1/2?

yup, you got it, do you understand what we did?

yes! thank you! and now can we do my next question ?

so putting everything together
base = 5
height = 6
surface area = 4*(1/2)(base)(height) + (base)^2

160?

but thats not on my answers

please check your calculations again

surface area = 4*(1/2)(6)(5) + (5)^2

85? so i was right then because i already have that answer checked?

yup, 85 is what I got too

What is the surface area of the right prism?
540 in2
486 in2
648 in2
972 in2

thanks!

surface area of a prism = 2*L*W + 2*W*H + 2*H*L
H = 18
W = 6
L = 9

*rectangular prism

648(:

What is the volume of the cone to the nearest tenth?
829.4 m3
1,520.5 m3
552.9 m3
1,244.1 m3

i think its a

What is the surface area of the pyramid to the nearest whole number?
96 cm2
132 cm2
72 cm2
156 cm2

a is incorrect, please try my formula

i got 1519 19/25

which is closest to answer b (probably because of rounding)

19/25 as a decimal is 0.760

thanku

helpful reminder:
surface area of pyramid = area of 4 triangles + area of square base

so (1/3)*3.14*8*(6^2) = 301 11/25

wrong formula.
area of triangle = (1/2)(base)(height)
area of square = (base)^2

so 24 and 36

right, and there are 4 triangles and 1 square
so
surface area = 4*area of triangle + area of squrae

132

great

do you know anything about this figure?
What is the volume of the composite figure?
192 ft3
76 ft3
152 ft3
96 ft3

hint: it's 2 prisms put together|dw:1435446620974:dw|

do u know what part would be length?

oh nvrm

|dw:1435446845195:dw|

A= 64
B= 12

right, so keep going

what do i do next?

64+12= 76

right

ok thanku

What is the volume of the square pyramid? Round to the nearest tenth.
40.0 cm3
480.0 cm3
147.3 cm3
720.0 cm3

volume of square pyramid = (1/3)(L)(W)(H)

480?

great

wouldnt this be rectangle?
Describe the cross section of the rectangular prism.
rectangle
hexagon
trapezoid
triangle

yup, good job

thank you for all your time and effort to help me!(:

no problem, I'm glad I was able to help