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Lines AB and CD are analogue to one another (hence the » on the lines). The exterior angles of a shape are the angles you get if you extend the sides. The video below explains how to calculate related angles, adjacent angles, internal angles and supplementary angles. (b and c, e and h, f and g are also vertically opposite). For any quadrilateral, we can draw a inclined line to watershed it into two triangles. Therefore the total angle sum of the quadrilateral is 360 degrees. Half of this is the angle on a straight line, which is 180°. (h and d, f and b, e and a are also corresponding). If we wealthy person a triangle, you can ever draw two synchronal lines like this: Now, we know that alternate angles are equal. So the three angles in the triangle must add up to 180 degrees. Now that we know the sum of the angles in a triangle, we can work out the sum of the angles in a quadrilateral.




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The right angle is the most general angle—the edges of your notebook paper, stair steps, door facings, the edges of picture frames—all of these form right angles. An acute standpoint is any standpoint that measures inferior than 90. 360 cloven by 2 equals 180—that is the measure of a unbowed angle. An obtuse angle measures greater than 90 but less than 180.


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Measuring Angles | ABCya!

ABCya's Measuring Angles activity provides kids with an interactive introduction to angles and how to measure them. A step by step guide presents right, obtuse, acute, full, physiological reaction and vertical angles in a definite concise format. There is also an exercise that enables kids to measure various angles with a half-circle protractor.

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