ABC is an arc of a circle with centre O and radius 5cm. The lines AD and CD are tangents to the circle at A and C respectively. Angle AOC =2*pi/3 radians. Calculate the area of the arc ABC giving your answercorrect to 2 significant figures.
2006-06-21 15:03:02 · 7 answers · asked by she_rocker 2 in Science & Mathematics ➔ Mathematics
The answer is 26.17
R^2 (x/2)= Area
Where R is the radius and x is the angle in radians
2(pi/3)= 2.09
5^2(2.09/2)=26.17
2006-06-21 15:24:13 · answer #1 · answered by sibilant_ghost 2 · 0⤊ 0⤋
angle in radians * radius
=10.47198cm
= 10 cm (2 sig. figures)
2006-06-21 22:17:30 · answer #2 · answered by sunil 3 · 0⤊ 0⤋
S=r*(theta)
theta = 2pi/3
r=5cm
2pi/3*5cm=10.47
2006-06-22 02:09:45 · answer #3 · answered by Ms.Lala 2 · 0⤊ 0⤋
(2*pi/3)/(2*pi) * pi * (5^2) = 26.18 cm^2
2006-06-21 23:21:23 · answer #4 · answered by Anonymous · 0⤊ 0⤋
sorry i only take 7th grade calclus!
2006-06-21 22:06:35 · answer #5 · answered by Yankees Chic 2 · 0⤊ 0⤋
do ur own dam homework!
2006-06-21 22:07:07 · answer #6 · answered by Blissful 3 · 0⤊ 0⤋
ohhh.....is that a math Q?
2006-06-21 22:06:51 · answer #7 · answered by ROn BoB 1 · 0⤊ 0⤋