"What is the ______ of this angle?", size, protractor, corner, "This angle is 60 ______.", angles, degrees, centimeters, "This is a ______. We use it to measure angles.", clock, protractor, ruler, "The corner of a book is a right ______.", size, degree, angle, "The symbol ______ stands for degrees.", °, +, :, "Place the center point of the protractor on the ______.", vertex, zero line, size

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