document.write( "Question 1006244: A brick 4 cm high is placed to stop a wheel of the car. Upper face of the brick is
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Algebra.Com's Answer #622390 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "sin(∠ACB) = 4/8 = 1/2\r\n" );
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document.write( "therefore ∠ACB = 30°\r\n" );
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document.write( "Therefore since ∠BCO = 90°, ∠ACO = 60°\r\n" );
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document.write( "Therefore ΔOAC is an equilateral triangle because the two radii, \r\n" );
document.write( "OA and OC are equal, making it isosceles, and it has one 60° angle.  \r\n" );
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document.write( "So all the sides of ΔOAC are equal, so OC=8.\r\n" );
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document.write( "So the radius of the wheel is 8, its diameter is 16 and its\r\n" );
document.write( "area is\r\n" );
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document.write( "pr² = p(8)² = 64p.\r\n" );
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document.write( "Edwin
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