The wind screen wiper of a car sweeps through an angle of 150.The blade of the wiper is 21cm long and the radius of the unswept sector 6cm . What area of glass is swept
+14966 The wind screen wiper of a car sweeps through an angle of 150.The blade of the wiper is 21cm long and the radius of the unswept sector 6cm . What area of glass is swept
\(A=( \pi r_1^2- \pi r_2^2)\times \frac{150deg}{360deg}\)
\(A=\pi\times(( 6+21)^2-6^2)cm^2\times \frac{150deg}{360deg}\)
\(A=907.135\ cm^2\) 
!
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+14966 The wind screen wiper of a car sweeps through an angle of 150.The blade of the wiper is 21cm long and the radius of the unswept sector 6cm . What area of glass is swept
\(A=( \pi r_1^2- \pi r_2^2)\times \frac{150deg}{360deg}\)
\(A=\pi\times(( 6+21)^2-6^2)cm^2\times \frac{150deg}{360deg}\)
\(A=907.135\ cm^2\) !
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