Areas Related to Circles: CBSE Class 10 Previous Year Questions
127 different questions from Areas Related to Circles (NCERT Chapter 11) asked in CBSE Class 10 Maths board exams 2022–2026.
Pick a mark group to practise, each with answers and step-by-step solutions.
In the given figure, chord AB subtends an angle of 120∘ at the centre of the circle with radius 7 cm. Find (i) perimeter of major sector OACB, and (ii) area of the shaded segment, if area of Δ OAB = 21.2 cm2.
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Answer: (i) 3130≈43.33 cm (ii) ≈30.13 cm2
(i) Major sector angle =360∘−120∘=240∘
Arc ACB =360240×2×722×7=388 cm
Perimeter =7+7+388=3130≈43.33 cm
(ii) Area of minor sector OAB =360120×722×72=3154≈51.33 cm2
A brooch is crafted from silver wire in the shape of a circle with a diameter of 35 cm. The wire is also used to create 5 diameters, dividing the circle into 10 equal sectors as shown in figure. Based on the above information, answer the following questions : (i) What is the radius of circle ? (1) (ii) What is the circumference of the brooch ? (1) (iii) (a) What is the total length of silver wire required ? (2) OR (iii) (b) What is the area of each sector of the brooch ? (2)
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Answer: (i) 17.5 cm (ii) 110 cm (iii) (a) 285 cm OR (b) 96.25 cm2
(i) Radius =235=17.5 cm.
(ii) Circumference =πd=722×35=110 cm.
(iii) (a) Wire = circumference + 5 diameters =110+5×35=285 cm.
(iii) (b) Each sector has central angle 36∘, i.e. 101 of the circle.