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1. Open Desmos. and click Open Geometry
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2. Click Log In
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3. Click Sign in with Google
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4. Once you are signed in, Click the plus sign to Add Item
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5. Click Add image and choose the screenshot from your Desktop files.
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6. Click the line tool
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7. Create a line over one of the streets
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8. Create two more lines over the other two streets
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9. Click the point tool
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10. Create a point over each of the two intersections
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11. Click the angle tool
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12. Click three points to measure an angle. To measure this angle, the top point on the image was clicked, then the intersection point, then the point next to "Alabama Ave".
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13. Click three points to measure another angle. To measure the 104.6 degree angle, the top point on the image was clicked, then the intersection point, then the point on the other side of Alabama Ave.
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14. Measure all angles
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14 steps should take 1 minute