10.3225806452 is the corect answer
2(10.8) = 21.6
2(8.3) = 16.6
21.6 + 16.6
Answer: 38.2
Answer: x=14
Step-by-step explanation:
1. Isolate x. Multiply both sides by 7. You should get 28=2x.
2. Divide each side by 2. You should then get 14=x.
Answer:
b² = a² + c² - 2ac cos B
Step-by-step explanation:
The cosine rule can be use when you are given three sides of a triangle and ask to find any angle or when you are given two sides and a included angles(the angle between the two sides given) and ask to find the length of a side.
The equation Sophia can use to solve for the side length(b) of a triangle when given two length and the included angle can be expressed below. Sophia was given two sides and an included angle and was asked to find a side length b.
For sides a, b and c the cosine rule can be represented below
a² = b² + c² - 2bc cos A
b² = a² + c² - 2ac cos B
c² = a² + b² - 2ab cos C
The equation required base on your question is
b² = a² + c² - 2ac cos B
