Ex 6.1, 3
Last updated at May 29, 2026 by Teachoo
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Exercise Set 6.1
Ex 6.1, 1
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Class 9
Chapter 6 Class 9 - Measuring Space: Perimeter and Area (Ganita Manjar
- Definition (and Quesitons)
- Perimeter of Different Shapes
- Perimeter of a Circle - C/D Ratio
- Pi is Irrational
- Length of an Arc of a Circle
- Problems, Puzzles, and Paradoxes on Perimeter
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Exercise Set 6.1
- Area of Square & Rectangle
- Area of a Parallelogram
- Area of a Triangle
- Heron's Formula
- Circumcircle and Incircle of a Triangle
- Brahmaguptaβs Formula for the Area of a Cyclic 4-gon
- Squaring a Rectangle
- Exercise Set 6.2
Transcript
Ex 6.1, 3 (i) Calculate the length of the arc of a circle if: (i) the radius is 3.5 cm and the angle at the centre is 60Β° Given Radius = r = 3.5 cm Angle = π = 60Β° Now, Length of an arc = 2ππ Γ π/(360Β° ) = π Γππ/π Γ π.π Γ (ππΒ°)/(πππΒ°) = 2 Γ22/7 Γ7/2 Γ 1/6 = 22/6 = 11/3 = 3.666β¦ cm Ex 6.1, 3 (ii) Calculate the length of the arc of a circle if: (ii) the radius is 6.3 cm and the angle at the centre is 120Β° Given Radius = r = 6.3 cm Angle = π = 120Β° Now, Length of an arc = 2ππ Γ π/(360Β° ) = π Γππ/π Γ π.π Γ (πππΒ°)/(πππΒ°) = 2 Γ22/7 Γ63/10 Γ 1/3 = 2 Γ22/1 Γ9/10 Γ 1/3 = 2 Γ22/1 Γ3/10 = 132/10 = 13.2 cm
