In a 4 side figure, the sum of all its internal angles are 360 degrees.
There are two angle given H and T
and two angles missing A and L
BUT the two angles missing are the same as angles H and T, because this is a paralelogram
that means we can write H + T = A + L
and. H + T + A + L = H + T + H + T = (2x + 60)+ ( x+30)+(2x+60)+(x+30) = 6x + 180
also H + T + A + L = 360
so then 6x + 180 = 360
now find x
x= (360-180)/6= 30
the question is : find angle T
T= x + 30 = 30 + 30 = 60
