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The picture has a circle, a triangle and some lines between them with some sums below it.
less than 90 degrees : acute angle
90 to 180 degrees : obtuse angle
180 to 270 degrees : reflex angle
When we draw a 30 degree line from the centre of square, it has 1/12 the area but not we calculate the lengths of the lines with its segment, fragment or sector.
At 30 degrees, from the middle, we travel 1/3 the length
as example take a 10m square
3.333 m * 5 m * 1/2 =
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