Answer:
C is approximately 10.3
Explanation:
To get the length of c, we use the cosine rule
This is;
The square of the missing side is equal the sum of the squares of the other sides minus 2 multiplied by the product of the two other sides and the cos of the angle facing the missing side
We have this as;
c^2 = 7^2 + 9^2 - 2(7)(9) * Cos 79
c^2 = 49 + 81 - 126 cos 79
c^2 = 130 - 24.042
c^2 = 105.96
c = √105.96
c = 10.29 which is approximately 10.3