°
Central angle of each sector = 360/ 7 = 51.4°
Sin (51.4 ° / 2) = (1.25/ 2 )/ r
Sin( 25.7°) = 0.625 r
0. 43/ 0.625 = r
r/2 = 0.69
d = 4(0.69) = 4( 0.69) = 2.79"
This is a trigonometry problem . You should draw a sector of 51.4° degree, and see the rissoles triangle
with 2 sides equal the radius, and the central angle of 51.4°.
12/5/2013

Parviz F.
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