Question

A steel plate of 800*1400mm is to be drawn to a scale of 1 :20. what will be the lengths in the drawing?
1)4mm,7mm
2)70mm,40mm
3)40mm,70mm
4)7mm,4mm

plz plz plz answer this question with explanation
if you want mark brainlist ​

Answer 1

$\huge{\underline{\bf{Answer:-}}}$

Assuming thickness of original plate and scale to be same.

Area of plate = 1120000mm

Sqr = area of scale

Actually volume shoud be equated but thickness is same.

Therefore area can be equated.

Area of scale = a × 20a

= 20a²

= 1120000mm²

a² = 56000

a = 236.64

Dimension = a × 20 a

= 236.64 × 1433.8

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