Richard requests his annual Social Security Statement from the IRS each year. He wants to check how many Social Security credits
he received for 2009. He worked January thru September and earned $2,304 per month. At the end of September his company had layoffs and Richard did
not work from October thru December. How many credits did he earn in 2009? *Required to earn at least 51092 per quarter.
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Given the values of the three sides of the triangle, we can apply the Cosine Law to find the angles of the triangle. Recall that for we can express the value of c through the equation below.
Rearranging this equation, we can find the value ∠C as shown below.
We can apply the same reasoning for finding the value of ∠B as shown.
Plugging in the values of the sides (see image attached) from the given. It will now be straightforward to compute for ∠B and ∠C.