I think that you that you take 17.5 and divide by 7. Then, take that answer and half it. This fulfills the area formula for a triangle, 1/2 base times height
Answer:
8 x 4 =4 fours+4 fours = 16+16= 32
Assuming the sum of the opposite angle would be 180. We can easily calculate for x and ultimately solve for the angle of B. We do as follows
B + D = 180
3x-12 + x = 180
4x - 12 = 180
4x = 192
x = 48 degrees
Therefore angle B would have a measurement of 132 degrees. Hope this helps.