Answer:
Hi your question lacks some vital figures but i think you are talking about a right angled triangle from the options you gave so i will explain how to get the height in general
Step-by-step explanation:
using the SOHCAHTOA rule
O = opposite side to the given angle ( the height )
H = hypotenuse side ( longest side ) of the triangle
A = adjacent side of the triangle
S = sine of the angle given
C = cosine of the angle given
T = Tangent of the angle given
Ф = 80
from your options you have all the possible answers bearing TANGENT
tan Ф = opposite / adjacent
tan 80 = height / adjacent by cross multiplication
if adjacent = 12
answer would be height ( x ) = 12 tan80
if adjacent = 6
answer would be height ( x ) = 6 tan80