Final answer:
True. It is important to never use a circular saw that doesn't have an upper blade guard because the guard is designed to protect you from touching the blade.
Step-by-step explanation:
True. It is important to never use a circular saw that doesn't have an upper blade guard because the guard is designed to protect you from touching the blade. A circular saw blade can be very sharp and can cause serious injuries if it comes into contact with your skin. The upper blade guard acts as a barrier between your hand and the blade, reducing the risk of accidents.