Question

determine o valor de x em cada caso:

Answer 1

a)
x² = 16²+10² - 2.16.10.(cos60)
x² = 256+100 - 320.(1/2)
x² = 356 - 160
x² = 196
x = √196
x = 14 m ✓

b)
x² = 7²+(3√2)² - 2.7.3√2.(cos45)
x² = 49+18 - 42√2.(√2/2)
x² = 67 - 42
x² = 25
x = √25
x = 5 cm ✓

c)
x² = 2² + √3² - 2.2.√3.(cos150)
x² = 4 + 3 - 4√3.(-√3/2)
x² = 7 + 6
x² = 13
x = √13 cm ✓