Advertisements
Advertisements
प्रश्न
The radius of two circles are in the ratio 3 : 5, find the ratio between their circumferences.
Advertisements
उत्तर
The ratio of the radius of the circles = 3 : 5
Let the radius of the first circle = 3x
and radius of the second circle = 5x
∴ Circumference of the first circle = 2πr
= 2π × 3x = 6πx
and circumference of the second circle = 2πr
= 2π × 5x = 10x
∴ The ratio between their circumference
= 6πx : 10πx
= 6 : 10
= 3 : 5
APPEARS IN
संबंधित प्रश्न
A brooch is made with silver wire in the form of a circle with diameter 35 mm. The wire also used in making 5 diameters which divide the circle into 10 equal sectors as shown in Fig. Find:
(i) the total length of the silver wire required
(ii) the area of each sector of the brooch
Below fig shows a sector of a circle, centre O. containing an angle 𝜃°. Prove that
Area of shaded region is`r^2/2(tantheta −(pitheta)/180)`
The sum of diameter of two circles is 112 cm and the sum of their areas is 5236 cm2 Find the radii of the two circles.
The radii of two circles are 48 cm and 13 cm. Find the area of the circle which has its circumference equal to the difference of the circumferences of the given two circles.
Construct an angle PQR = 45°. Mark a point S on QR such that QS = 4.5 cm. Construct a circle to touch PQ at Q and also to pass through S.
The circumference of a circle exceeds its diameter by 450 cm. Find the area of the circle.
A 4.2m wide road surrounds a circular plot whose circumference is 176m. Find the cost of paving the road at Rs.75per m2.
The cost of fencing a circular field at the rate of Rs.250 per metre is Rs.55000. The field is to be ploughing at the rate of Rs.15 per m2. Find the cost of ploughing the field.
Circumference of a circle is always ______.
Ratio of the circumference of a circle to its diameter is denoted by symbol ______.
