Question

the height of an arch is 2m and breadth is 20 m. without changing the radius of an arch it's breadth is taken 48 m.find the new height of an arch
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Answer 1

Answer:

Given that:

Width of the door =6m

Height =2m

To find: 

Radius of the arc=?

Solution:

Let r be the radius of the arc.

In right angled triangle

r2=32+(r−2)2   (By Pythagorus theorem)

or, r2=9+r2−4r+4

or, 4r=13

or, r=413=3.25m