Is RBT a right angle

To determine if RBT is a right angle, you would need to check if the measure of angle RBT is 90 degrees. If the angle measures exactly 90 degrees, then it is a right angle. Alternatively, you could use geometric tools or properties, such as the Pythagorean theorem or the use of a protractor, to verify this. Without additional information, it's not possible to definitively say if RBT is a right angle.