Скачать или смотреть Areas Related to Circles 03 | Class 10 Maths Chapter 12 | Exercise 12.1 | The wheels of a car of

Ex 12.1 Class 10 Maths Question 4.
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 travelling at a speed of 66 km per hour?
Ex 12.1 Class 10 Maths Question 5.
Tick the correct answer in the following and justify your choice: If the perimeter and the area of a circle are numerically equal, then the radius of the circle is
(a) 2 units
(b) n units
(c) 4 units
(d) 7 units

Ex 12.1 Class 10 Maths Question 3.
The given figure depicts an archery target marked with its five scoring regions from the center outwards as Gold, Red, Blue, Black, and White
The diameter of the region representing Gold score is 21 cm and each of the other bands is 10.5 cm wide. Find the area of each of the five scoring regions.
Areas Related to Circles 01 | Circles | Class 10 Maths Chapter 12 | Exercise 12.1 | CBSE #ncert

Ex 12.1 Class 10 Maths Question 1.
The radii of the two circles are 19 cm and 9 cm respectively. Find the radius of the circle which has a circumference equal to the sum of the circumferences of the two circles
Ex 12.1 Class 10 Maths Question 2.
The radii of two circles are 8 cm and 6 cm respectively. Find the radius of the circle having area equal to the sum of the areas of the two circles.

Class 10 Maths Areas Related To Circles Mind Maps

Terms Related To Circle

(i) Chord: A line segment joining any two points on a circle.
(ii) Arc: A piece of a circle between two points on the circle is called an arc.

The arc less than the semicircular arc is called minor arc and the one greater than the semi-circular arc is called major arc.
(iii) Sector: The portion of a circular region enclosed by two radii and the corresponding arc is called a sector of the circle.
Sector smaller than the semi-circle is called minor sector and the sector larger than the semi-circle is called major sector.
(iv) Segment: The portion of a circular region enclosed between a chord and the corresponding arc is called a segment of the circle.
The set of all points in a plane which are at a fixed distance from a fixed point in the plane is called circle. The fixed point is called centre and the fixed distance is called radius of the circle

Circumference and Area of a Circle
(i) The circumference of a circle is defined as distance covered by travelling once around a circle and is given by C = 2πr = πd
where r = radius of the circle and d = diameter of the circle.
(ii) The Area of a circle of radius r is given by,
A = πr2=π4d2 where, d = diameter of the circle.
(iii) Area of a circular ring:
The area of the circular path or ring is given by the difference of the area of outer circle and the area of inner circle.
Area of circular ring = n(R2 – r2)

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