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12 Jun 2017, 21:40
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As in the image, we can join the centre of the circle with the corner of rectangle that touches the circle.
We can make a right angled triangle as shown.
The hypotenuse of this triangle is obviously 'r', the other two sides will becomes 'r-2' and 'r-4' respectively.
(thats because the small rectangle is 2 cm by 4 cm)
Applying Pythagoras theorem, (r-2)^2 + (r-4)^2 = r^2
we get r=10.
Hope this helps.
We can make a right angled triangle as shown.
The hypotenuse of this triangle is obviously 'r', the other two sides will becomes 'r-2' and 'r-4' respectively.
(thats because the small rectangle is 2 cm by 4 cm)
Applying Pythagoras theorem, (r-2)^2 + (r-4)^2 = r^2
we get r=10.
Hope this helps.
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IMG_20170613_095429.jpg [ 1.69 MiB | Viewed 1147 times ]
