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Jari-jari dan titik pusat lingkatan 4x² + 4y² – 4x − 12y + 1 = 0 adalah…..

Jari-jari dan titik pusat lingkatan 4x² + 4y² – 4x − 12y + 1 = 0 adalah…..
A. 3/2 dan (-1/2, 1)
B. 3/2 dan (-1/2, 3/2)
C. 3/2 dan (1/2, 3/2)
D. 3 dan (1, 3)
E. 3 dan (-1, 3)

x² + y² + Ax + By + C = 0
x² + y² – x – 3y + 1/4 = 0
Pusat Lingkaran (a,b)
= (-1/2 A , -1/2 B)
= (1/2 , 3/2)
Jari – jari (r)
= akar [a² + b² – c] = akar [ (1/2)² + (3/2)² – (1/4) ] = akar [ 1/4 + 9/4 – 1/4 ] = akar 9/4
= 3/2
Jawabannya C

Baca Juga :  Complete the sentences with a form of the verb in parentheses. Three hundred and fifty years ago, people (1. make) /made/ their own clothes. They (2. have, not) _____ machines for making clothes. There (3. be, not) _____ any clothing factories. People (4. tear) _____ homemade clothes that were sewn by hand. Today, very few people (5. make) _____ their own clothes. Clothing (6. come) _____ ready-made from factories. People (7. buy) _____ almost all their clothes from stores. The modern clothing industry (8. be) _____ international. As a result, people from different countries often (9. wear) _____ similar clothes. For example, people in many different countries throughout the world (10. wear) _____ jeans and t-shirts. However, some regional differences in clothing still (11. exist) _____ for instance, people of the Arabian deserts (12. wear) _____ loose, flowing lobes to protect themselves from the heat of the sun. In parts of Northern Europe, fur hats (13. be) _____ common in the winter. In the future, there (14. be, probably) _____ fewer and fewer differences in clothing. People throughout the world (15. wear) _____ clothes from the same factories. (16. We all, dress) _____ in the future? TV shows and movies about the future often (17. show) _____ everybody in a uniform of some kind. What (18. you, think) _____? Number 12