Answer: 12.96 and 8.87 units respectively
Explanation:
The sine rule states that the ratio between a side of a triangle and the sine of the angle opposing the side will be equal for all three sides of the same triangle.
For Q20, we can get the equation
and from here we can solve for x which is 12.96 so the answer to Q20 is 12.96 units.
For Q21, the angle opposite of x can be found by summing up the two known angles and subtracting that from 180° to get 43°. From here, we can get the equation
and solve for x which is 8.87 so the answer to Q21 is 8.87 units