For this question, you don't need to use the sine or cosine rules. Instead, since you have the area of the triangle, you can use the two lengths and area to rearrange the formula for the area of a non right angled to find the angle.
If 1/2absin(c) = 4, then 1/2 (4.3)(4.3)sin(x) = 4, rearrange for sin(x). Once you have one value for x(probably from a calculator), look at the graph of y= sin(x) to see other values of x that give the same value of sin(x) (whilst still having x less than 180 degrees so it can make a triangle)
If 1/2absin(c) = 4, then 1/2 (4.3)(4.3)sin(x) = 4, rearrange for sin(x). Once you have one value for x(probably from a calculator), look at the graph of y= sin(x) to see other values of x that give the same value of sin(x) (whilst still having x less than 180 degrees so it can make a triangle)
What help do you need? You seemed to have solved it. All you need to do is put that fraction into the inverse of cos function on your calculator. On most calculators it looks like cos to the power of -1.
What help do you need? You seemed to have solved it. All you need to do is put that fraction into the inverse of cos function on your calculator. On most calculators it looks like cos to the power of -1.
When an angle is written as "BAC" for example, it means the angle between the line BA and AC, or what you wrote down as simply A. People write it like that to avoid ambiguity. It doesn't mean to find all three angles.
When an angle is written as "BAC" for example, it means the angle between the line BA and AC, or what you wrote down as simply A. People write it like that to avoid ambiguity. It doesn't mean to find all three angles.