- 1). Draw various size obtuse angles on a piece of paper using a pencil and protractor. Use the bottom edge of the protractor as a ruler to draw a two-inch straight line. Place the protractor's center on one endpoint of the line and mark any measurement between, but not including, 90 and 180 degrees. Connect the marking with the same endpoint. Draw another obtuse angle with a different measurement within the range.
- 2). Stretch rubber bands around the pegs of a geoboard to create an obtuse angle. Pull a rubber band horizontally across two or three pegs and, using the same left peg, stretch another rubber band up and to the left to create a measurable obtuse angle.
- 3). Place your wrists together with your palms facing one another and separate your hands --- making a wide "V" shape --- to create an obtuse angle. Use this example to realize that obtuse angles are all around, if you look for them.
- 4). Find 10 obtuse angles in your home (like wide-open scissors) and in nature with items such as tree limbs and flagstone walkways.
- 5). Use a protractor and pencil to create your own shapes using obtuse angles. Draw one angle and use the extending line segment as the basis for the next obtuse angle. Make various-sided shapes using only obtuse angles.
- 6). Practice creating and recognizing the angles over and over to reinforce the concept and allow the knowledge to become second nature. The more you surround your mind with obtuse angles, the more you comprehend the geometric topic.
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