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vitfil [10]
3 years ago
9

A circle have a diameter of 18 meters. What is its

Mathematics
1 answer:
Sergio [31]3 years ago
3 0

Answer:

A. 56.54867 rounded to 56.56

Step-by-step explanation:

18/2=9

r=9

C=2πr=2·π·

C=2(3.14)(9)

9≈56.54867

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Use 1/2ab sin C formula pls
Harman [31]

Step-by-step explanation:

area =  \frac{1}{2} a.b \sin(C)  \\ from \:cosine \: rule \\  {c}^{2}  =  {a}^{2}  +  {b}^{2}  - 2a.b \cos(C)  \\ 36 = 144 + 81 - (2 \times 12 \times 9) \cos(C)  \\ 189 = 216 \cos(C)  \\  \cos(C)  = 0.875 \\ C =  \cos {}^{ - 1} (0.875) \\ C = 28.96 \degree \\ area =  \frac{1}{2}  \times 144 \times 9 \times  \sin(28.96 \degree)  \\ area = 313.8 \: sq \: units

3 0
3 years ago
In the figure above, AB is tangent to the circle with center O
Radda [10]

<u>Given</u>:

Given that O is the center of the circle.

AB is tangent to the circle.

The measure of ∠AOB is 68° and we know that the tangent meets the circle at 90°

We need to determine the measure of ∠ABO.

<u>Measure of ∠ABO:</u>

The measure of ∠ABO can be determined using the triangle sum property.

Applying the property, we have;

\angle ABO+\angle BAO+\angle AOB=180^{\circ}

Substituting the values, we get;

\angle ABO+90^{\circ}+68^{\circ}=180^{\circ}

Adding the values, we have;

\angle ABO+158^{\circ}=180^{\circ}

Subtracting both sides by 158, we get;

\angle ABO=22^{\circ}

Thus, the measure of ∠ABO is 22°

6 0
3 years ago
One half a number yes more. than 22
weqwewe [10]

what? um child.... anyways

4 0
3 years ago
Use the diagram to complete the statement.
Elanso [62]
75° because they are alternate interior angles
3 0
3 years ago
A culture started with 2000 bacteria. After 4 hours, it grew to 2,200 bacteria. Predict how many bacteria will represent after 9
S_A_V [24]
Y=2000*e^{k*t}

2200=2000*e^{k*4}

e^{k}= ( \frac{22}{20} )^{(1/4)}<span>

so,
 y at t=8 is  2000*(</span><span>( \frac{22}{20} )^{(1/4)})^8
 y = 2000(22/20)^2=2000*1.21=</span><span>2420 thats the answer i hope.</span>




4 0
3 years ago
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