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Help plxx

 Mar 26, 2020
 #1
avatar+20768 
+2

There's too much missing to answer most of these questions.

 

Question #3 can be answered using Heron's formula:  Area  =  sqrt( s·(s - a)·(s - b)·(s - c) )

 Mar 26, 2020
 #2
avatar+111360 
+2

1 )

 

Missing angle =  180 - 130  - 19  =   31°

 

Using  the Law of Sines

 

x / sin  130°  =   7 / sin 31°          where x  is  the side opposite the obtuse angle

 

x  =  7 sin 130°  / sin 31°   ≈  10.4 ft

 

 

cool cool cool

 Mar 26, 2020
edited by CPhill  Mar 26, 2020
 #3
avatar+111360 
+1

2 )

 

Law  of Sines

 

 

x/ sin 19°   =  7 / sin 31°

 

x =  7 sin 19° / sin 31° = 4.425

 

Area  =

 

(1/2)  (x) (7)sin 130°

 

(1/2)(4.425) ( 7)  sin 130°   

 

11.86  ft^2

 

 

cool cool cool

 Mar 26, 2020
 #4
avatar+111360 
+2

4 )   Let  the area  painted green  =   G

 

Let  the area  painted  blue  =  2G  =   area painted red

 

Area  painted red  =  [ ( 2G)  / ( G + 2G + 2G) ]  pi * 8^2   =  (2/5)pi * 8^2  =  25.6 pi  in^2  =

 

80.42  in^2

 

 

cool cool cool

 Mar 26, 2020

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