Question

.

Answer 1

???

Answer 2

yes for exercise 6 and 7 and think yes - ok. ?

Answer 3

okay!

Answer 4

so we start with 6.
there are 3 semicircle - yes ?

do you can calculi area of these semicircle ?

Answer 5

Are the semi circles the top 2 shaded areas

Answer 6

and so easy you can calculi area of this triangle from the center of this figure - yes ?

because this is a right triangle with dimensions of diameters of these semicircles

Answer 7

are the semi circles the two top shaded areas?

Answer 8

i saying about exercise 6 now - ok. ?

Answer 9

oh- sorry I thought we were doing 5

Answer 10

okay i'll calculate the semicircles

Answer 11

For the semi circles I got 14.10 and 25.12

Answer 12

why just two when there are 3 semicircles ?

Answer 13

Sorry let me do the other

Answer 14

39.25

Answer 15

area of a circle is pi*r^2 so for a semicircle will be pi*r^2 /2
used this ?

Answer 16

yes

Answer 17

I got 39.25, 25.12, and 14.10 for each semi circle.

Answer 18

ok. so area for semicircle with radius 5 is 39,25 for with radius 4 is 25,12 and with radius 3 is 14.10

yes ?

Answer 19

yes

Answer 20

ok. now you need calculi area of this triangle - do you can ?

Answer 21

this is a right triangle

Answer 22

with base length 8 and height 6

Answer 23

24

Answer 24

do you see it why ?

Answer 25

24 yes exactly

Answer 26

yes because 3 is half the length of one side and 4 is the other

Answer 27

yes - right

Answer 28

what do I do next

Answer 29

so for you get area of this shaded region you need assuming area of these semicircles and area of this triangle and after you get this result so from this you need subtracting area of these white triangles

ok. ?

Answer 30

okay, how to I find the area of the white triangles?

Answer 31

these are right triangles - so areas of them is easy to calculi - yes ?

Answer 32

would it be 5x5 divided by 2 for the top one

Answer 33

exactly

Answer 34

so total it would be 24.75

Answer 35

you calculed it right ? i belive you

Answer 36

for my answer I got 77.75 cm

Answer 37

but this is the sum of areas of semicircles - yes ?

Answer 38

yes

Answer 39

this 24,75

Answer 40

and area of this triangle ?

Answer 41

which one?

Answer 42

i have all the measures how do I find the area of the shaded part?

Answer 43

sorry - this 24,75 is area of these white triangles

Answer 44

yes

Answer 45

actually I just got 25

Answer 46

that's the sum of all the triangles

Answer 47

ok

so now you need assuming these area of these semicircle and the area of this triangle from the center of this figure

and from this result you need subtracting the sum of areas of these white triangles

right ?

Answer 48

yes

Answer 49

okay I got 77.5

Answer 50

cm\[77.5cm ^{2}\]

Answer 51

77,5 for what ?

Answer 52

my answer

Answer 53

you have made it how i ve said above ?

Answer 54

yes

Answer 55

and there in your math book this is the right answer too ?

Answer 56

I just checked yes it's correct

Answer 57

ok. so now this mean that you understand it right sure how you need solve it this exercise 6
yes ?

Answer 58

yes, thank you very very much

Answer 59

but now we can starting again with exercise 7 - do you like it ?

but was my pleasure and anytime

so we start with 7 ?

Answer 60

yes and actually number 5

Answer 61

sorry but with nr. 5 i m not sure

Answer 62

but i will can try it with nr. 5 too
so how you like it now we start with 7 or 5 ?

Answer 63

5 if it is no trouble with you

Answer 64

ok.

Answer 65

where should I start?

Answer 66

just a moment

Answer 67

okay

Answer 68

we start with part of the top - the semicircle from the top

so there is a triangle with base length equal 4 +4
and the height equal with the length of radius so 4 too

yes ?

Answer 69

yes

Answer 70

so area of this triangle you can calculi it easy

Answer 71

yes both would be 8

Answer 72

yes but you need getting area of this great white triangle not separate

Answer 73

okay, so 16

Answer 74

exactly save it please

and now than you know that the length of radius is 4 so how many will be the area of this semicircle from the top ?

Answer 75

how to I figure that out?

Answer 76

there is a semicircle with this white triangle - yes ?

Answer 77

yes-

Answer 78

so you ve got area of this white triangle and now you need calculi area of this semicircle

Answer 79

okay, how do i find that? what's the formula

Answer 80

you ve used it in case of your past exercise pir^2 / 2

Answer 81

okay, never mind

Answer 82

25.12

Answer 83

that's for half the semi circle

Answer 84

ok.

so for you get these areas of these shaded parts from the left and right corners just you need subtracting from the area of the semicircle the area of this white triangle

yes ?

Answer 85

yes, i got 9.12

Answer 86

so quickly - very nice

Answer 87

thank you!

Answer 88

and what is with the bottom part ?

Answer 89

i'm not sure, i can't figure out how to find the area of that

Answer 90

why ? this is easy too

looke please

hope you know that a circle has 360 degrees - yes ?

Answer 91

yes

Answer 92

ok so than a semicircle how many has ?

Answer 93

180

Answer 94

exactly so now you know that the semicircle from the bottom part has 180 degrees

and from this you see that the midle part of 60 degrees is shaded - yes ?

sorry for my english but hope you understand me

Answer 95

you're fine- i understand you! okay i see

Answer 96

okay the bottom shaded part would be 8.37?

Answer 97

because the semi circle would be 25.12, then divide by 3

Answer 98

thank you

moment please

so we know that the semicircle has 180 degrees and ...

this is extraordinary - now i believe it sure that you understood it all right

this is great - so quickly you calculed it - very nice