Answer:
Step-by-step explanation:
By applying sine rule in the given triangle,
cos(25°) = [tex]\frac{\text{AC}}{AB}[/tex]
cos(25°) = [tex]\frac{b}{400}[/tex]
b = 400[cos(25°)]
b = 362.52
b = 363 ft
By applying sine rule in the given triangle,
sin(25°) = [tex]\frac{\text{Opposite side}}{\text{Hypotenuse}}[/tex]
sin(25°) = [tex]\frac{a}{400}[/tex]
a = 400[sin(25°)]
a = 169.05
a = 169 ft
m∠A + m∠B + m∠C = 180°
25° + m∠B + 90° = 180°
m∠B = 180° - 115°
m∠B = 65°
