Question

https://i.postimg.cc/RZxY8MZD/IMG-7859-1.jpg

https://i.postimg.cc/RVwmqp32/IMG-7860-1.jpg

Answer 1

@jhonyy9

Answer 2

drawn it please

Answer 3

so than may be possibile

Answer 4

2.

Answer 5

r=41+3=44 cm

one rotation = circumference = 2∗π∗44=88π

number of rotations = 96712/88π = 1099π≈3453

none of the options matches it.

Answer 6

is that right ?

Answer 7

circumference = 276,3 cm what i ve get

Answer 8

ohh ok i'm trying to see which of the choices are it

Answer 9

bill i ve got 350

Answer 10

and this is there between these choices

Answer 11

oh ok i got you

Answer 12

nice so than the second one ?

Answer 13

i made a drawn for second please chek it and wait your idea for it

Answer 14

5.
2x+8+5+5=42
2x=24
x=12
other side=12+8=20
sides are 12,20

Answer 15

and how you found 350 on the 4 ?

Answer 16

96712/276,3 = 350,02

Answer 17

this 276,3 is what i ve got for circumference

Answer 18

ok. ?

Answer 19

ok

Answer 20

https://i.postimg.cc/D0ZhS7Xg/IMG-7856-1.jpg

https://i.postimg.cc/yx5MWcB1/IMG-7857-1.jpg

Answer 21

any idea for the first one

how you think what have from there the bigest volume ?

Answer 22

yes sure after was increased by ten factor these different parts of them

Answer 23

ok

step by step

please try writing for every form pyramid,cylinder,cone and sphere formula of volume

Answer 24

Increase the area of the base of the square pyramid by a factor of ten

Answer 25

I might be wrong

Answer 26

ok

for pyramid formula for volume is area of base time altitude divide 3

yes

Answer 27

?

Answer 28

yes

Answer 29

so than increase area of base by a factor of ten so from this result what ?

Answer 30

will result that the volume of pyramid will be increased by ten time

yes ?

Answer 31

YES

Answer 32

ok

now try rethink this same for cylinder - what will result ?

Answer 33

1. with A => V = A*h/3

A = 10A

V_new = 10A*h/3 = 10V

yes ?

Answer 34

do you in the first case of pyramid increased the area result for volume increased for en time too

yes ?

Answer 35

increased for ten time

sorry i missed the t

Answer 36

ok ?

this is case of pyramid

so in case of cylinder how will be ?

Answer 37

bill courage please

Answer 38

comme en

formula for volume of cylinder what is ?

Answer 39

V_cylinder = area of base time height of cylinder

yes ?

Answer 40

yes

Answer 41

so given that the height was increased by factor of ten

Answer 42

V_cylinder = A*h

height increased by 10 so

V_increased = A*10h = 10Ah = 10V

what mean that we get 10V same with the case of pyramid

yes ?

Answer 43

do you understand it ?

Answer 44

can i going in case of the cone ?

Answer 45

V_cone = area of base *h/3 = pi*r^2 *h/3

increased the radius by 10

V_cone increased = pi*(10r)^2 *h/3 = 100*pir^2 *h/3 = 100V

so from this result that the new volume is greater than the first volume by 100

do you understand till here ?

Answer 46

V_sphere = 4pi*r^3 / 3

V_sphere increased = 4pi*(10r)^3 /3 = 4pi*1000*r^3 /3 = 1000V

so from these above wrote what is the bigest volume ?

Answer 47

bill you dont understand what is made ?

Answer 48

V is the initial volume for every form - pyramid,cylinder,cone and sphere

yes ?

Answer 49

do you have questions ?

Answer 50

@Mehek please your opinion ? ty

Answer 51

it's D right ?

Answer 52

it's B for 1

and 2 is B ?