A chord of length 16 cm is drawn in a circle of radius 10 cm. The distance of the chord from the centre of the circle is

8 cm

No worries! We‘ve got your back. Try BYJU‘S free classes today!

12cm

No worries! We‘ve got your back. Try BYJU‘S free classes today!

6cm

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

10cm

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B 6cm
$G i v e n - O i s t h e c e n t r e o f a c i r c l e o f r a d i u s 10 c m . A B i s a c h o r d o f t h e g i v e n c i r c l e a n d A B i s a t a d i s t a n c e o f 6 c m f r o m O . T o f i n d o u t - T h e l e n g t h o f A B = ? . S o l u t i o n - W e j o i n O A a n d d r o p a p e r p e n d i c u l a r O N t o A B . O N m e e t s A B a t N . N o w A N = \frac{1}{2} A B s i n c e t h e p e r p e n d i c u l a r, d r o p p e d f r o m t h e c e n t r e o f a c i r c l e t o i t s a n y c h o r d b i s e c t s t h e l a t t e r . ∴ A N = \frac{1}{2} \times 16 c m = 8 c m . A g a i n O A i s t h e r a d i u s o f t h e c i r c l e a n d O A = 10 c m a n d O N i s t h e p e r p e n d i c u l a r d r o p p e d f r o m O t o A B a t N . ∴ O N i s t h e p e r p e n d i c u l a r d i s t a n c e o f A B f r o m O . ∴ Δ O A N i s a r i g h t t r i a n g l e w i t h O A a s h y p o t e n u s e . S o, a p p l y i n g P y t h a g o r a s t h e o r e m, w e g e t O N = \sqrt{{O A}^{2} - {A N}^{2}} = \sqrt{10^{2} - 8^{2}} c m = 6 c m . A n s - O p t i o n C .$

Suggest Corrections

Similar questions

12

10

10

6

Join BYJU'S Learning Program