Open Center Protractor, Plastic, 4" Base, Clear, DozenThe angles make it very easy to follow for younger learners.Ruler is scaled in metric and inch measurements.Sharply defined graduations help minimize visual errors.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzes reviews to verify trustworthiness.