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e-lub [12.9K]
2 years ago
5

Can anyone help me out? thanks

Mathematics
2 answers:
Alik [6]2 years ago
8 0

Answer:

450 cm

Step-by-step explanation:

12 degrees is 1/30 of the circumference because there are 360 degrees in a circle.

The minor arc length of 15 is in the same ratio to the circumference as  the 2 angles , so the circumference = 30 * 15 - 450 cm.

frosja888 [35]2 years ago
6 0

Answer:

B = 450 cm

Step-by-step explanation:

Length of arc = theta/360 * 2 * pi * r

We know the length of the arc = 15, theta = 12

Substitute these values in

15 = 12/360 * 2 * pi * r

15 = 1/30 * 2 * pi * r

Solve for r

15 = 1/15 * pi * r

15*15 = pi * r

225/pi = r

Circumference = 2* pi * r

Circumference = 2 * pi * 225/pi

Circumference = 2 * 225

Circumference = 450 cm

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3 years ago
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cestrela7 [59]
<span><span> <span>Akar akar persamaan kuadrat 2x² - 3x -1 = 0 adalah x1 dan x2. Persamaan kuadrat baru yang akar akarnya satu lebih kecil dari dua kali akar akar persamaan kuadrat di atas adalah ........</span></span><span><span><span>A.x² - x - 4 = 0</span><span>B.x² + 5x - 4 = 0</span><span>C.x² - x + 4 = 0</span></span><span><span>D.x² + x + 4 = 0</span><span>E.x² - 5x - 4 = 0</span></span></span><span>Jawaban : A
Penyelesaian : 
Akar-akar persamaan lama :  x1 dan x2
                                             
Akar-akar persamaan baru :  xA dan xB
                                             xA = 2x1 - 1
                                             xB = 2x2 - 1
                                             xA + xB  = (2x1 - 1) + (2x2 - 1)
                                                           = 2 (x1 + x2) - 2
                                                           = 2 () - 2
                                                           = 3 - 2
                                              xA + xB = 1
    
                                              xA . xB = (2x1 - 1) (2x2 - 1)
                                                          = 4 x1.x2 - 2(x1 + x2) + 1
                                                          = 4.(-) - 2() + 1
                                                          = -2 - 3 + 1
                                              xA . xB = -4
    
Jadi persamaan kuadrat baru : x² - (xA + xB)x + xA . xB = 0
                                              x² - x - 4 = 0

</span></span>
4 0
3 years ago
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