Advertisements
Advertisements
प्रश्न
The circumference of a circle exceeds its diameter by 18 cm. find the radius of the circle.
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
The wheels of a car are of diameter 80 cm each. How many complete revolutions does each wheel make in 10 minutes when the car is traveling at a speed of 66 km per hour? [Use Π = 22/7]
In the given figure, ∆ ABC is a right-angled triangle in which ∠ A is 90°. Semicircles are drawn on AB, AC and BC as diameters. Find the area of the shaded region
A car travels 1 km distance in which each wheel makes 450 complete revolutions. Find the radius of wheel.
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.
OACB is a quadrant of a circle with centre O and its radius is 3.5 cm. If OD = 2 cm. find the area of
- quadrant OACB
- the shaded region.
The circumference of a circle is numerically equal to its area. Find the area and circumference of the circle.
The diameter of two circles are 28 cm and 24 cm. Find the circumference of the circle having its area equal to sum of the areas of the two circles.
The diameter of a circular well is 4.2 m. What is its circumference?
A circle with radius 16 cm is cut into four equal parts and rearranged to form another shape as shown in the below figure:
Does the perimeter change? If it does change, by how much does it increase or decrease?
