2. Get a referral for physiotherapy. If your back pain is recurring (chronic) and caused by weak spinal muscles, poor posture or degenerative conditions such as osteoarthritis, then you need to consider some form of rehabilitation.. Get a referral for physiotherapy. If your back pain is recurring (chronic) and caused by weak spinal muscles, poor posture or degenerative conditions such as osteoarthritis, then you need to consider some form of rehabilitation.
The exterior angle of a triangle is equal to 1  . the value of its adjacent angle. 2  the sum of its opposite interior angles.  the product of its opposite interior angles.
Thus, by the Exterior Angle Theorem, the sum of those angles is equal to the measure of the exterior angle. We have. While not always necessary, we can check our solution using our previous knowledge of lines.