Tentukan luas persegi panjang KLMN berikut.

Tentukan luas persegi panjang KLMN berikut.

Tentukan luas persegi panjang KLMN berikut.

Jawabannya adalah 49/4 √3 cm

Konsep :
sin L = sisi depan sudut L/sisi miring sudut L
cos L = sisi samping sudut L/sisi miring sudut L

sin 30ᵒ = 1/2
cos 30ᵒ = 1/2 √3

Luas persegi panjang = panjang x lebar

Jawab :
sin L = sisi depan sudut L/sisi miring sudut L
sin 30ᵒ = KN/NL
1/2 = KN/7
7/2 = KN
KN = 7/2 cm
KN = lebar = 7/2 cm

cos L = sisi samping sudut L/sisi miring sudut L
cos 30ᵒ = KL/NL
1/2 √3 = KL/7
7/2 √3 = KL
KL = 7/2 √3 cm
KL = panjang = 7/2 √3 cm

Luas persegi panjang = panjang x lebar
= 7/2 √3 cm x 7/2 cm
= 49/4 √3 cm

Jadi luas persegi panjangnya adalah 49/4 √3 cm

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 9