If you can separate the figures and the segment, or angle in question, is the same, the reflexive property of congruence can be used in the proof. ... Separating the two triangles, you can see Angle Z is the same angle for each triangle. Since they are the same angle, the angle is congruent to itself.
7x+12
8x+3
Because it is a horizontal line the two angles must add up to 180°
So add the two angles up together and set it equal to 180°
7x+12+8x+3=180
Add the two x’s 7x+8x=15x
Add the constants 12+3=15
You get 15x+15=180
Now subtract 15 from both sides
15x=165
Now divide by 15 to get x
X=11
Multiply 6 and 20 and then subtract 16 which would be 104 blocks