Answer:
f = 29
Step-by-step explanation:
First look at the angle inside the triangle that has no marker. You can determine this angle using the angle on the opposite side (112).
A straight line will equal 180. So this angle would equal 180 - 112 or 68.
Now you know two of the triangles angles.... 53 and 68.
A triangle's inside angles always add up to 180 degrees.
53 + 68 = 121
The angle that is 2f + 1 must equal 180 - 121 which is 59 degrees.
2f + 1 = 59
2f = 58
f = 29
The three angles inside the triangle are 53, 68 and 59
