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7.5 सेमी त्रिज्या के वृत्त का दृतीय तार काटकर एक 120 सेमी विज्या के दृतीय पहिए की परिधि पर लपेटा जाता है। तार
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Step-by-step explanation:
A circular wire of radius 7.5 cm is cut and bent along the circumference of a circle of radius 120 cm. Find the angle subtended at the centre of the hoop.
- Now radius of circle = 120 cm
- So circumference of circle is 2πr
- = 2 x π x 120
- = 240 π cm
- Now radius of circular wire is 7.5 cm
- Therefore circumference of wire will be 2 x π x 7.5
- = 15 π cm
- Now length of arc will be = 15 π cm
- So length of arc is rθ
- So l = rθ
- 15 π = 120 θ
- Or θ = 15 π / 120
- Or θ = π / 8
- So the angle which is subtended at the centre is π / 8 = 22.5 degree
Reference link will be
https://brainly.in/question/5930881
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