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A rectangular block of wood, ABCD, leans against  a vertical wall, as shown in th diagram below. 

AB = 8cm, BC = 5cm and angle BA^E = 28o.

Find the vertical height of C above the ground. 

 

Guest May 13, 2017
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 #1
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The height of C above the ground  =  BE + FB

 

BE  =  AB * sin (28)  =  8 *sin (28)

FB  =  BC * cos(28)  =  5 * cos (28)

 

So......

 

BE + FB   =

 

 8 * sin (28)  +  5 * cos (28)  ≈  8.17 cm

 

 

cool cool cool

CPhill  May 13, 2017
 #2
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+1

Thank you so much! 

Guest May 13, 2017

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