sarapereira17 sarapereira17

10-08-2017
Mathematics

contestada

Find the radius of a circle in which the central angle of (pie /4 ) radian determines a sector with an area of 86m^2

A-14.80m
B-20.92m
C-68.44 m
D- 10.46m

Respuesta :

Аноним Аноним

10-08-2017

area of sector = 1/2 * r^2 * x where r = radius and x = angle in radians

86 = 1/2 * r^2 * pi/4

r^2 = 2 * 86 * 4 / pi = 219

r = sqrt 219

= 14.80

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