This week we learned about the sin law

which is :sinA/a = sinB/b = sinC/c

we can use this formula to solve the angle or the line

so we have to solve what is the AC

we already know what is the angle c is 80 degree and the c line is 5 cm , and we also know the angle b is 30 degree

so we can use this function that just use two of them

sin C/c = sin C /b

sin80 degree/5cm=sin30 degree/AC

AC=(sin30*5 )/sin80 degree

AC=2.5cm(use the calculator)

ok , and we also learn how to solve the cos line

thanks for reading