C-16-Q110mediumsingle_mcq

Length of arc subtending angle $\theta°$ at the centre of a circle of radius $r$ is —

a $\dfrac{\pi r \theta}{180°}$
b $\dfrac{\pi r \theta}{360°}$
c $\dfrac{\pi r^{2}\theta}{180°}$
d $2\pi r\theta$

ব্যাখ্যা

Arc length is the fraction $\frac{\theta}{360°}$ of the full circumference $2\pi r$ , which simplifies to $\frac{2 π r θ}{360 °} = \frac{π r θ}{180}$ . This formula gives the arc that subtends a central angle of .

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এই অধ্যায়ের আরও প্রশ্ন

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C-16-Q119Diameter of a circular field is m and there is a m wide road around it. Radius of outer circle is —

°

\frac{2\pi r\theta}{360°}=\frac{\pi r\theta}{180°}

\frac{2 π r θ}{360°} = \frac{π r θ}{180°}

\theta°

C-16-Q120Approximate area of the road around the field above is —

Chapter 16: Mensuration — সব প্রশ্ন দেখুন (210টি) →

Length of arc subtending angle θ°\theta°θ° at the centre of a circle of radius rrr is —

ব্যাখ্যা

এই অধ্যায়ের আরও প্রশ্ন

Length of arc subtending angle $\theta°$ at the centre of a circle of radius $r$ is —