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©2005abcteach.com Name: ___________________________ How Do We Measure Angles? ed a ruler. A ruler uses units called . A protractor uses units called degrees protractor can measure angles starting from the left or from the right. It circle. A protractor is half of a circle, tractor in the picture rotractor is measuring an angle starting Right Angles Lets look at right angles in real life. Right angles are very important. are sitting in. Where 2 walls and the are three right angles. Where the the floor is a little bit more than 90 angles? List them in the space below: Right angles are found in manypictures below. How many right angles does each shape or solid have? are perpendicular, they are perpendicular, they Obtuse and Acute Angles Obtuse and acute angles are found in many geometric shapes and solids.e you see as obtuse or acute. Figure ALWAYSobtuse angleALWAYS Obtuse Acute Acute Obtuse Figure 1 Answer Key: ece of paper have? (4 right angles) Page 4: How many right angles does each shape or solid have? 3. Triangle: 1 5. Cube: 24 (6 faces X 4 right angles for each face) e; the bottom 2 angles are obtuse