Question
Length of a chord in a circle of radius 'r' cm, is 40 cm
and distance between chord and centre of the circle is 21 cm. Find the value of (2r + 1).Solution
AB is the chord of circle.
Perpendicular line joining the centre of circle and chord, bisects the chord.
i.e. AC = BC = (40/2) = 20 cm
By Pythagoras theorem,
OA 2 = OC 2 + AC 2
Or, r 2 = 21 2 + 20 2
Or, r 2 = 441 + 400
Or, r 2 = 841
So, 'r' = 29
But length cannot be negative. So, 'r' = 29
Required value = 2 X 29 + 1 = 59
The soils are called saline soils which have:
Match list I with list II
A silent mutation causes
Poor man’s meat is:
Which type of microorganism is the causative agent of coccidiosis, a disease that leads to symptoms like diarrhea, unthriftiness, or even death in fowl?...
In which type of epithelial tissue the absorption and secretion occur, as in the inner lining of the intestine?
During germination radical and plumule develop from?
The cytoplasmic inheritance shows which type of differences?
An SI engine sometimes continues to run for a very small period even after the ignition is switched off. This phenomenon is called:
Red delicious is the variety of which fruit?
Relevant for Exams:
