Solve problemson scale drawings.
1.the figure shows a scale drawing of the 'Two fic''building with a scale of 1mm:12m.If the height of the building in the drawing is 3.5 cm,find its actual height in m.
Solve problems on maps and plans.
2.the scale of the plan of a flat is 1:200.If the dimensions of this flat are 4.5cm X 3.3 cm on the plan, find its actual area in m^2.
2Q of mathsF.2 ,thankyou(20點)
2012-12-06 4:56 am
回答 (3)
2012-12-06 6:15 pm
1) 3.5cm =35mm
the actual height =35 x 12m =420m //
2) the actual area =4.5cm x 200 x 3.3cm x 200=594000cm ^2
the actual area in m^2 =594000/(100 x100) =59.4 m^2 //
the actual height =35 x 12m =420m //
2) the actual area =4.5cm x 200 x 3.3cm x 200=594000cm ^2
the actual area in m^2 =594000/(100 x100) =59.4 m^2 //
2012-12-06 5:44 am
1 )
12m=(12x100x10)mm
=>1:12000
3.5x12000=42000(mm)
MM to M=42000÷10÷100
SO the answer = 42M
The building's actual height is 42M.
2)
because of the plan 1cm=actual 200cm
4.5x200x3.3x200=900x660=540000cm^2
=>1m^2=10000cm^2
Its actual area is 54m^2
2012-12-06 10:24:10 補充：
******************************************************************************************************2)
because of the plan 1cm=actual 200cm
4.5x200x3.3x200=900x660=594000cm ^2
=>1m^2=10000cm^2
Its actual area is 5.94m^2
.
2012-12-06 10:24:37 補充：
*******59.4m^2
12m=(12x100x10)mm
=>1:12000
3.5x12000=42000(mm)
MM to M=42000÷10÷100
SO the answer = 42M
The building's actual height is 42M.
2)
because of the plan 1cm=actual 200cm
4.5x200x3.3x200=900x660=540000cm^2
=>1m^2=10000cm^2
Its actual area is 54m^2
2012-12-06 10:24:10 補充：
******************************************************************************************************2)
because of the plan 1cm=actual 200cm
4.5x200x3.3x200=900x660=594000cm ^2
=>1m^2=10000cm^2
Its actual area is 5.94m^2
.
2012-12-06 10:24:37 補充：
*******59.4m^2
收錄日期: 2021-04-23 22:12:06
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https://hk.answers.yahoo.com/question/index?qid=20121205000051KK00297