Diagram isnt given. However, a picture illustribg the possible scenarios has been attached to help.
Answer:
KINDLY CHECK EXPLANATION
Explanation:
Given the triangles A and B below :
Using trigonometric ratios :
If triangle A is given ;
Then ; MN will be obtained using the SIN relation :
Sin 20 = opposite (MN) / hypotenus (21)
If triangle B is given ;
Then ; MN will be obtained using the TAN relation :
Tan 20 = opposite (MN) / Adjacent (21)