This gives the shoulder a ______ degree angle with the ground.

This gives the shoulder a ______ degree angle with the ground.

• A. 60
• B. 90
• C. 45
• D. 120

Answer: (B)

The key idea is how the limb is oriented relative to the ground. When the shoulder’s position makes the limb stand perpendicular to the ground, the angle between the limb and the ground is a right angle. In the diagram, the shoulder and forelimb are arranged so the limb is vertical to the ground, giving a ninety-degree angle. That’s why this option fits best. If the limb were slanted toward the ground, the angle would be smaller (like 60 or 45 degrees), and if it were past vertical, you’d get an obtuse angle such as 120, but the depicted position is a perpendicular alignment, so ninety degrees is correct.

The key idea is how the limb is oriented relative to the ground. When the shoulder’s position makes the limb stand perpendicular to the ground, the angle between the limb and the ground is a right angle. In the diagram, the shoulder and forelimb are arranged so the limb is vertical to the ground, giving a ninety-degree angle. That’s why this option fits best. If the limb were slanted toward the ground, the angle would be smaller (like 60 or 45 degrees), and if it were past vertical, you’d get an obtuse angle such as 120, but the depicted position is a perpendicular alignment, so ninety degrees is correct.