Answer:
BC is 40.8
B° is 59.03°
C° is 30.96°
Step-by-step explanation:
classic pythagoras (a² + b² = c²)
35² + 21² = 1666
sqrt1666 = 40.8
you do tan(x) here because you want to find B° and only know the opposite and adjacent sides.
35/21 = 1.66...
tan-¹(1.66..) = 59.03°
you do tan(x) here because you want to find C° and only know the opposite and adjacent sides.
21/35 = 0.6
tan-¹(0.6) = 30.96°
