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Snowcat [4.5K]
3 years ago
6

the diagram shows a circle inside a square ABCDB AB = 20 cm. the radius of the circle is 9 cm. work out the area of the shaded r

egion

Mathematics
1 answer:
OlgaM077 [116]3 years ago
5 0

Step-by-step explanation:

Area of the square = a²

= 20²

= 400cm²

Area of the circle = πr²

= 22/7 × 9²

= 22/7 × 81

= 254.57cm²

Area of the shaded region = Area of the square - Area of the circle

= 400cm² - 254.57cm²

= 145.43cm²

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3 years ago
A ball is thrown horizontally at a speed of 20 meters per second from the top of a cliff. how long does the ball take to fall 19
nekit [7.7K]
Use one of the equations  of motion under gravity.

s = ut + 1/2 gt^2     where s = distance, u = initial speed , t = time and  g = acceleration due to gravity ( = 9.8 ms^-2)

Initial  downward speed is zero so we have

19.6 = 0t + 1/2 * 9.8 t^2
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3 0
3 years ago
there are 11 days until Richards's concert. Susie's concert is 7 days after Richard's. How many days are there until Susie's con
matrenka [14]
There are 11 days until Richards's concert.
Susie's concert is 7 days after Richard's.

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answer
D. 11+7=18
8 0
3 years ago
The admission fee at a concert is $4.00 for children and $8.00 for adults. On the first day, 2350 people enter the concert and $
rjkz [21]

Answer:

1,600

Step-by-step explanation:

C=4.00

A=8.00

C+A=2,350  

C=2,350-A

4C+8A=12,400

4(2,350-A)+8A=12,400

9,400-4A+8A=12,400

4A=12,400-9,400

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A=3,000/4

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4 0
3 years ago
In a recent international sport competition, the top 3 countries— Country A, Country B, and Country C— won a total of 134 medals
vlada-n [284]

Answer:

Country A = 85, Country B = 29, Country C = 20

Step-by-step explanation:

A+B+C=134 ----- eq(1)

B=C+9 ------------ eq(2)

A=36+B+C ------ eq(3)

By substituting eq(2) in eq(3), we get:

A=36+C+9+C

A=2C+45 ------- eq(4)

Now substituting eq(2) & eq(4) in eq(1), we get

2C+45+C+9+C=134

4C+54=134

4C=134-54

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Now putting the value of C in eq(2),

B=20+9

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Substituting the value of B & C in eq(1), we get:

A+29+20=134

A+49=134

A=134-49

A=85

6 0
3 years ago
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