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.
This tells us that the measure of the exterior angle equals the total of the other two interior angles. In fact, there is a theorem called the Exterior Angle Theorem which further explores this relationship: