Question

. One side of a square garden is 8.5 decametres. What
is the cost of fencg it at the rate of 24 paise per
metre?
100 metres long and 110 metres​

Answer 1

Answer:

6cm

As we all know that , radius is perpendicular to the tangent at the point of contact . So , there will be a formation of a right angled triangle , where the line joining the centre and the external point will be hypotenuse .

[ figure in attachment ]

=> OA² + AB² = OB²

=> ( 8cm )² + AB² = ( 10 cm)²

=> AB² = 100 cm² - 64 cm²

=> AB² = 36 cm²

=> AB = 6cm .

Hence the required answer is 6cm .