@astute99 said:If two circles of radius 3 cm and 5 cm intersect each other at two points and the distance between their centres is 4 cm. Then find the length of their common chord.
6?
@astute99 said:correct but approach plz
Try drawing figure...
Plot the distances of any one end point of common cord wrt centres of both circles.
U will get an right angled triangle is formed with two centres and one end of common cord.
Right angled triangle with sides 3,4,5.
So Centre of smaller circle lies on common cord.
Hence length of common cord= diameter of smaller circle= 6cm
Plot the distances of any one end point of common cord wrt centres of both circles.
U will get an right angled triangle is formed with two centres and one end of common cord.
Right angled triangle with sides 3,4,5.
So Centre of smaller circle lies on common cord.
Hence length of common cord= diameter of smaller circle= 6cm
@astute99 said:If two circles of radius 3 cm and 5 cm intersect each other at two points and the distance between their centres is 4 cm. Then find the length of their common chord.
6 cm?
@astute99 said:correct but approach plz
draw the figure and u wl realize that with the radius of the two traingles and the distance btwn der centres u get a right angled traingl.. so 3cm is the height of the right angled traingle.. thrfore the length of commn chord is 3*2.. wl post the image if u dnt get it..
@astute99
Look at the figure..
From fig, 9 - x^2 = 25 - (4+x)^2
solve to get x = 0..
That means the chord passes through centre of smaller circle.. so its the diametre.. 2*3 = 6
@Shray14 said:There are 6 person with 6 tasks. Task 1 cannot be assigned to either 1 or 2 . Task 2 must be assigned to either 3 or 4..every person must assigned one task. In how many ways does assignement be done??
144?
@adream27 said:draw the figure and u wl realize that with the radius of the two traingles and the distance btwn der centres u get a right angled traingl.. so 3cm is the height of the right angled traingle.. thrfore the length of commn chord is 3*2.. wl post the image if u dnt get it..
kar do image attach bhai
@astute99 In fact you don't need to do all that.. 3-4-5 is a pythogorean triplet.. Question over 😁 
I posted it for understandings sake.. :)
@SarayuSheshadri said:@astute99 In fact you don't need to do all that.. 3-4-5 is a pythogorean triplet.. Question over I posted it for understandings sake..
was thinking d same, but i liked ur post.. worst case scenario le k chalne wala..
spherical balls are put layer by layer in a conical flask inverted upside down such that each one touches the sides and the layer below it. If the diameter of bottom most ball is 8cm and that at the 5th level is 18cm. Find the diameter of the ball at the 3rd layer.
1)12 cm
2)13 cm
3)8root3 cm
4)none
@krum said:spherical balls are put layer by layer in a conical flask inverted upside down such that each one touches the sides and the layer below it. If the diameter of bottom most ball is 8cm and that at the 5th level is 18cm. Find the diameter of the ball at the 3rd layer.1)12 cm2)13 cm3)8root3 cm4)none
13 cm?
@krum said:spherical balls are put layer by layer in a conical flask inverted upside down such that each one touches the sides and the layer below it. If the diameter of bottom most ball is 8cm and that at the 5th level is 18cm. Find the diameter of the ball at the 3rd layer.1)12 cm2)13 cm3)8root3 cm4)none
I remember doing this one time..and am sure ki 13 nahi tha...Mene bhi directlykia tha den mujhe sir ne samjhaya tha...Let me think kya tha :P
Hadd hai..Ho hi nahi raha 
@krum said:spherical balls are put layer by layer in a conical flask inverted upside down such that each one touches the sides and the layer below it. If the diameter of bottom most ball is 8cm and that at the 5th level is 18cm. Find the diameter of the ball at the 3rd layer.1)12 cm2)13 cm3)8root3 cm4)none
Is ans 12?
@ayushnasa said:@krum Iska OA nahi hai?? Shayad 12 hai -_-
@adwaitjw said:Is ans 12?
don't have OA , actually got this 1 in litmus today . I was under the impression that it would be a cake walk, but attempted only 16/20 in qa and got trolled in lr :splat:
tell me the approach puys !!