Step-by-step explanation:
value of d = 90° ( as it's a perpendicular)
e = 49° ( vertically opposite angle)
as, sum of all angles on a straight line is 180°
so,
48° + f = 180°
f = 180 - 49 = 131°
f = 131°
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Each number is multiplied by 3. 3x3=9, 9x3=27, and so forth. the answer is logically 243
