Advertisements
Advertisements
प्रश्न
The circumference of a circle exceeds its diameter by 18 cm. find the radius of the circle.
Advertisements
उत्तर
Let c be the circumference and d be the diameter of the circle.
∴ c = d + 18
⇒ dπ = d + 18 ⇒ dπ − d = 18
d(π − 1) = 18
⇒ `"d"(22/7-1)` = 18
⇒ `"d"(15/7) =18`
⇒ d =`(18xx7)/15=126/15` = 8.4 cm
∴ Radius =`"d"/2=8.4/2` = 4.2 cm
APPEARS IN
संबंधित प्रश्न
An elastic belt is placed around the rim of a pulley of radius 5 cm. (Fig. 10) From one point C on the belt, the elastic belt is pulled directly away from the centre O of the pulley until it is at P, 10 cm from the point O. Find the length of the belt that is still in contact with the pulley. Also find the shaded area (use π = 3.14 and `sqrt3=1.73)`
The minute hand of a clock is 10cm long. Find the area of the face of the clock described by the minute hand between 9 A.M. and 9.35 A.M.
The circumference of a circle exceeds diameter by 16.8 cm. Find the circumference of
circle.
A field is in the form of circle. A fence is to be erected around the field. The cost of fencing would to Rs. 2640 at rate of Rs.12 per metre. Then the field is to be thoroughs ploughed at cost of Rs. 0.50 per m2. What is amount required to plough the field?
A plot is in the form of rectangle ABCD having semi-circle on BC. If AB = 60m and BC = 28m, find the area of plot.
In the given figure, OPQR is a rhombus, three of whose vertices lie on a circle with centre O. If the area of the rhombus is `32sqrt(3)`, find the radius of the circle.
Find the area and perimeter of the circles with following: Diameter = 35cm
Find the perimeter of the given shape (Take π = `22/7`).
Find the number of revolutions made by a circular wheel of area 1.54 m2 in rolling a distance of 176 m.
