asked Sep 27, 2018 in Class IX Maths by navnit40 (-4,939 points) circles. The arc length l and area A of a sector of angle θ in a circle of radius … In Figure, two concentric circles with centre O, have radii 21 cm and 42 cm. _____m/s What is the area of another circle B whose diameter is half the radius of the circle A? Find the area (in sq. 29.79 cm C. 21.38 cm B. In the circle Centre is O, and the Radius is 5cm. Find: (i) the length of the arc (ii) area of the sector formed by the arc (iii) area of the segment formed by the corresponding chord. If ∠AOB = 60°, find the area of the shaded region. Find the Length of the Arc. Find: (i) the length of … We have, r = Radius of the region representing Gold score = 10.5 cm ∴ r 1 = Radius of the region representing Gold and Red scoring areas = (10.5 + 10.5) cm = 21 cm = 2r cm r 2 = Radius of the region representing Gold, Red and Blue scoring areas = (21 + 10.5) cm = 31.5 cm = 3r cm r 3 = Radius of the region representing Gold, Red, Blue and Black scoring areas = (31.5 + 10.5) cm = 42 cm = 4r cm Example 1: A sector is cut from a circle of radius 21 cm. Concept: Areas Related to Circles Examples and Solutions. 16.24 cm C. 17.29 cm B. A circle with a radius of 21 cm has an area of ~1,385.44 square cm. Circumference of a circle A is $$\Large 1\frac{4}{7}$$ times perimeter of a square. Area of the square is 784 sq cm. [Use π = 22/7] Solution. In the given figure, two concentric circles with centre O have radii 21 cm and 42 cm Mensuration (C10) In the given figure, two concentric circles with centre O have radii 21 cm and 42 cm. Radius (r) of circle = 21 cmAngle subtended by the given arc = 60° Length of an arc of a sector of angle θ = Length of arc ACB = = 22 cm. The angle of the sector is 150 degree . Find the length of its arc and area. In a Circle of Radius 21 Cm, an Arc Subtends an Angle of 60° at the Centre. (ii) area of the sector formed by the arc. Find the length of its arc and area. R S Aggarwal and V Aggarwal Solutions for Class 10 Mathematics CBSE, 18 Areas of Circle, Sector and Segment. Find: (i) The length of the arc (ii) Area of the sector formed by the arc (iii) Area of the segment forced by the corresponding chord from kaustuv ( ongoing questions ) to Completed Questions In a circle of radius 5 cm, AB and CD are two parallel chords of lengths 8 cm and 6cm respectively. (Last Updated On: January 21, 2020) Problem Statement: ME Board October 1996, ME Board April 1997 . A sector is cut from a circle of radius 21 cm. Answer of In a circle of radius 21 cm, an arc subtends an angle. Question 21. Problem Answer: The area of a regular octagon inscribed in a circle of radius 10 cm is 283 sq. What is the area of a circle with a DIAMETER of 60 cm (radius of 30 cm)? Find:(i) length of the arc. We have, r = Radius of the region representing Gold score = 10.5 cm ∴ r 1 = Radius of the region representing Gold and Red scoring areas = (10.5 + 10.5) cm = 21 cm = 2r cm r 2 = Radius of the region representing Gold, Red and Blue scoring areas = (21 + 10.5) cm = 31.5 cm = 3r cm r 3 = Radius of the region representing Gold, Red, Blue and Black scoring areas = (31.5 + 10.5) cm = 42 cm = 4r cm Example 3 Find the area of the segment AYB shown in figure, if radius of the circle is 21 cm and ∠AOB = 120°. 1 answer. Find (0 the length of the arc (ii) area of the secter formed by the arc. Given the radius or diameter and pi you can calculate the circumference. A puck of mass m = 1.50 kg slides in a circle of radius r = 23.0 cm on a frictionless table while attached to a hanging cylinder of mass M = 2.90 kg by a cord through a hole in the table. (Last Updated On: January 21, 2020) Problem Statement: EE Board April 1990 . In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. It Takes 38 S For The Stone To Make 45 Complete Revolutions. In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. The radius of the circle which has circumference equal to the sum of the circumference of two circles is (a) 35 cm (b) 10 cm (c) 21 cm (d) 28 cm. 19.18 cm D. 15.67 cm Two circles of different radii are concentric. A circle of radius = 10.5 or diameter = 21 or circumference = 65.97 cm has an area of: 3.4648 × 10 0 square kilometers (km²); 0.03464 square meters (m²) 346.4 square centimeters (cm²) A-1, Acharya Nikatan, Mayur Vihar, Phase-1, Central Market, New Delhi-110091 Calculate the distance between the chords if they are (i) On the same side of the centre (a) What Is The Period Of Rotation? Now let's draw a perpendicular bisector of the Chord AB at D, OD is 3 cm. (Use π = 22/7 ). If AB and CD intersect at a point E inside the circle and CE has length 7 cm, then the difference of the lengths of BE and AE, in cm, is? The area of a regular hexagon inscribed in a circle of radius 1 is? In a circle of radius 11 cm, CD is a diameter and AB is a chord of length 20.5 cm. In a given circle, Radius (r) = 21 cm And, = 120° Area of segment AYB = Area of sector OAYB – Area of ΔOAB Area of sector OAYB = /360×2 Problem Answer: The area of a regular hexagon inscribed in a circle of radius 1 is 2.598 . Sol. find the circumference of a circle with a radius of 21 cm. For a circle, three lengths most commonly are applied: The radius – defined above; The diameter – the distance from edge to edge of a circle passing through its origin or center. In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. The radius, the diameter, and the circumference are the three defining aspects of every circle. (Use π = 3.14) 5. A circle has radius √2 cm. 0 votes. A. 15.78 cm D. 14.56 cm Three identical cicles are tangent to each other externally. What speed keeps the cylinder at rest? Q. Question 21. Find: (i) the length of the arc (ii) area of the sector formed by the arc. It is divided into two segments by a chord of length 2cm.Prove that the angle subtended by the chord at a point in major segment is 45 degree . If the area of the curvilinear triangle formed by the point of tangency of the three circles is 142 cm2, compute the radius of each circle. 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