Question

Please can anyone help me with this question? I'm really struggling with it

Answer 1

Answer:

83.9°

Step-by-step explanation:

Pythagorean theorem, the well-known geometric theorem that the sum of the squares on the legs of a right triangle is equal to the square on the hypotenuse (the side opposite the right angle)—or, in familiar algebraic notation, a2 + b2 = c2.

a= 13 cm

a2= 169cm

b= 4cm

b2=16 cm

a2+b2= 185cm (c2)

c=13.6cm

after wards use the law of cosines and c= 83.9°