# in a circle of radius 21 cm

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### in a circle of radius 21 cm

A circle with a radius of 21 cm has an area of ~1,385.44 square cm. I am installing a 1 yard-wide walk around circular swimming pool that is 21 ft in diameter. 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) Now let's draw a perpendicular bisector of the Chord AB at D, OD is 3 cm. The radii of two circles are 19 cm and 9 cm respectively. Circumference of a circle A is $$\Large 1\frac{4}{7}$$ times perimeter of a square. What is the area of another circle B whose diameter is half the radius of the circle A? The angle of the sector is 150º. 15.78 cm D. 14.56 cm Three identical cicles are tangent to each other externally. In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. In a circle of radius 21 cm, an arc subtends an angle of 60Â at the centre Find: (i) Area of the sector formed by the arc (ii) Area of the segment forced by the corresponding chord - Math - Areas Related to … A sector is cut from a circle of radius 21 cm. Find the Length of the Arc. (ii) area of the sector formed by the arc. 3). Find (0 the length of the arc (ii) area of the secter formed by 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 1: A sector is cut from a circle of radius 21 cm. Find the area (in sq. A puck of mass m = 1.26 kg slides in a circle of radius r = 25.0 cm on a frictionless table while attached to a hanging cylinder of mass M = 2.04 kg by a cord through a hole in the table. Given the radius or diameter and pi you can calculate the circumference. 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 . use π=22/7? Answer of In a circle of radius 21 cm, an arc subtends an angle. [Use π = $$\frac{22}{7}$$] (2013D) Solution: (i) Length of the arc: r = 21 cm, θ = 60° Length of the arc. Sol. 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. Question 21. In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. (Last Updated On: January 21, 2020) Problem Statement: ME Board October 1996, ME Board April 1997 . The area of a regular hexagon inscribed in a circle of radius 1 is? Problem Answer: The area of a regular octagon inscribed in a circle of radius 10 cm is 283 sq. 19.18 cm D. 15.67 cm Two circles of different radii are concentric. The formula to calculate the area of a circle is A = pi r^2 This means that if r = 5 "cm", the area is A = 5^2pi " cm"^2 = 25 pi " cm"^2 ~~ 78.539816 " cm"^2. (Use π = 3.14) 5. 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? Let's draw the CHORD cutting the Circumference at AB, and join AB with the Cente. 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. Q. A chord of a circle of radius 10 cm subtends a right angle at the centre. What speed (in m/s) keeps the cylinder at rest? In Figure, two concentric circles with centre O, have radii 21 cm and 42 cm. Find:(i) length of the arc. 1.57 Cm/s (answer Is Incorrect) Question: You Whirl A Stone In A Circle Of Radius 21 Cm. 0.84 S (answer Is Correct.) In a circle of radius 5 cm, AB and CD are two parallel chords of lengths 8 cm and 6cm respectively. What speed keeps the cylinder at rest? A. Problem Answer: The area of a regular hexagon inscribed in a circle of radius 1 is 2.598 . There are two other important distances on a circle, the radius (r) and the diameter (d). 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. It Takes 38 S For The Stone To Make 45 Complete Revolutions. A circle has radius √2 cm. 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. In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. (Last Updated On: January 21, 2020) Problem Statement: EE Board April 1990 . Area of the square is 784 sq cm. Find: (i) the length of the arc (ii) area of the sector formed by the arc. Kaustuv Mohanty moved 381) In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. What is the area of a circle with a DIAMETER of 60 cm (radius of 30 cm)? (a) What Is The Period Of Rotation? Area of region ABDC = π × 60/360 (42 2 – 21 2) = 22/7 × 1/6 × 63 × 21 cm) of a regular octagon inscribed in a circle of radius 10 cm? 0 votes. Concept: Areas Related to Circles Examples and Solutions. The diameter is the distance from one side of the circle to the other at its widest points. 1 answer. find the circumference of a circle with a radius of 21 cm. A-1, Acharya Nikatan, Mayur Vihar, Phase-1, Central Market, New Delhi-110091 In a circle of radius 21 cm, and arc subtends an angle of 60° at the centre. A circle has radius √2 cm. (b) What Is The Magnitude Of The Average Speed Of The Stone? In a circle of radius 21 cm, an arc subtends an angle of 60° at the centre. Find: (i) the length of … Use this easy and mobile-friendly calculator to compute the area of a circle given its diameter. Answer/ Explanation. The arc length l and area A of a sector of angle θ in a circle of radius … In a circle of radius 11 cm, CD is a diameter and AB is a chord of length 20.5 cm. Question 21. Area of sector OACB = In ΔOAB, 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 30 cm ) of a square ) and the diameter ( D ) and 9 cm.. At the centre 19.18 cm D. 15.67 cm two circles are 19 and. Ab, and join AB with the Cente Statement: ME Board October 1996, Board. The corresponding: ( i ) On the same side of the secter formed by the arc Maths navnit40... 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