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When two rays intersect at a common endpoint they form an angle.
45 degrees math. A straight angle measures 180. An angle is measured in or radians. A 45 45 90 degree triangle or isosceles right triangle is a triangle with angles of 45 45 and 90 and sides in the ratio of note that it s the shape of half a square cut along the square s diagonal and that it s also an isosceles triangle both legs have the same length. Probably because old calendars such as the persian calendar used 360 days for a year when they watched the stars they saw them revolve around the north star one degree per day.
See 45 degree angle stock video clips. If the two arms of an angle extend in exactly opposite directions it is a straight angle. 90 angle 45 angle angle icon 45 degree 180 turn triangle angle angle illustration degree angle 45 degrees 180 icon. A simple method by means of which we can calculate the value of sine ratios for all the degrees is discussed here.
Also 360 can be divided exactly by 2 3 4 5 6 8 9 10 12 15 18 20 24 30 36 40 45 60 72 90 120 and 180 which makes a lot of basic geometry easier. The common endpoint is called the vertex and the rays are called the arms of the angle. Thus the sine of angle α is a ratio of the length of the opposite side bc to the angle α and its hypotenuse ab.
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