PLZ HELP. THIS IS EASY PROBABLY HAHA. WILL GIVE THANKS AND BRAINLIEST!!! 15 POINTS

Mathematics

2 answers:

sukhopar [10]3 years ago

6 0

The answer is: " 125.6 sq units " ; or, write as: " 125.6 units² " .
____________________________________________________
Explanation:
___________________________________
To solve for the "area of the shaded region" :
___________________________________
1) We find the area of the: "circle with radius of 11" ; that is, the entire circle that includes the entire outer circle—incorporating the shaded region AND non-shaded region. Record that value.
________________________________________________________
2) Then we find the area of the: "circle with radius of 9" ; that is; the entire "inner circle" that is "inside the shaded region". Record that value.
________________________________________________
3) Then, we take the [area of the "circle with radius of 11"] ; and from that value, subtract the: "[area of the circle with radius of 9"] ; to get the value of the "area of the shaded region" {that is, the "area of the blue ring"} .
________________________________________________
Let us begin:

1) Find the area of the: "circle with radius of 11" ;

The formula for the area, "A" of a circle is:

→ " A = $\pi$ r² " ;

in which: " A = area of the circle" (in "units² " ; or "square units" ; or "sq units") ;

" $\pi$ = 3.14 " (approximation) ;

" r = radius = 11 " ;
____________________________________________
→ Plug in these values to solve for the "area of the circle with radius of 11" :

→ A = $\pi$ r² ;

A = (3.14) * 11² ;

A = (3.14) * 11 * 11 ;

A = (3.14) * 121 ;

A = 379.94 units²
__________________________________________________

2) Now, let us find the area of the: "circle with radius of 9" ;

The formula for the area, "A" of a circle is:

→ " A = $\pi$ r² " ;

in which: " A = area of the circle" (in "units² " ; or "square units" ; or "sq units") ;

" $\pi$ = 3.14 " (approximation) ;

" r = radius = 9 " ;
____________________________________________
→ Plug in these values to solve for the "area of the circle with radius of 9" :

→ A = $\pi$ r² ;

A = (3.14) * 9² ;

A = (3.14) * 9 * 9 ;

A = (3.14) * 81 ;

A = 254.34 units²
______________________________________________________
2) Now, let us subtract the "area of the circle with radius of 9" ; FROM:
the "area of the circle with radius of 11" ;
_____________________________________________________

3 7 9. 94 units²
— 2 5 4. 34 units²
________________________
1 2 5 . 60 units²

______________________________________________________
The answer is: " 125.6 sq units " ; or, write as: " 125.6 units² " .
______________________________________________________

KATRIN_1 [288]3 years ago

5 0

I'm most likely wrong because I haven't learned this yet but I'm guessing .25 or 1/4

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