Find the indicated part of each triangle Give exact values w

Find the indicated part of each triangle. Give exact values whenever possible. Otherwise, round answers to the nearest hundredth. If no such triangle exists, state \"No such triangle exists.\"

Solution

0=10, b=7, B=43 degree

b²=o²+x²-2oxcos B

b²=100+49-140 cos 43

b=6.83

Correct option is A