Question

Tolong dibantu teman..
Terima kasiih

Answer 1

1. x² = 4² + 5² - 2.4.5.cos 60
    x² = 16+25-20
    x² = 21
     x = √21 cm

2. QR² = PQ² + PR² - 2.PQ.QR.cos P
    QR² = 5² + 8² - 2.5.8.cos 60
    QR² = 25 + 64 - 40
    QR² = 49
     QR = 7
   
    L = √s(s-PQ)(s-PR)(s-QR); s= (1/2)keliling
    L = √10(10-5)(10-8)(10-7)
    L = √10.5.2.3
    L = 10√3 cm²

3. aturan segitiga:
    h/sin 60 = 50/sin 30
               h = 50√3 meter