You can use the law of sines....sinA/a = sinB/b = sinC/c
guessing the wall forms a 90 degree angle, the missing angle would be 26. Therefore, sin 64/173 = sin 26/ X. You are left with sin26 / (sin 64 / 173) . Rounding to the nearest hundreths...It would be approximately 143.39 feet from the wall.
