Given that, Area between the circumferences of two concentric circles is $2464c{{m}^{2}}$ Circumference of inner circle $=132$ cm Circumference $=2\pi r$ $132=2\pi r$ $r=132/2\pi $ $r=\left(...

Given that, Radii of two concentric circles are $6$ cm and $13$ cm respectively. ${{r}^{2}}=6cm$ ${{r}^{2}}=13cm$ Area between two concentric circles = Areas of larger circle – area of smaller...

Assume r be the radius of inner circle, And $(r+1)$ be the radius of outer circle Area of circular ring = Area of outer circle – Area of inner circle $\pi {{\left( r+1 \right)}^{2}}-\pi...

Given that, Diameter of a cycle wheel =$4\frac{5}{11}cm=49/11cm$ Circumference of circle $=\pi d$ Circumference of circle $=22/7\times 49/11$ Circumference of circle $=14cm$ $=1.4m$ Distance...

Given that, Circumference of a garden roller $=280cm$ Total distance travelled $=490m$ Number of revolutions $=490/2.8=175$ Answer is $=175$

According to given question, Diameter of wheel, $d=35cm$ Radius of circle = Half of the diameter $r=d/2$ So, Radius of wheel $=35/2=17.5cm$ Circumference of circle $=2\pi r$ $=2\times 22/7\times...

Given that, Diameter of the wheel $=42cm$ Radius of the wheel, r $=42/2=21cm$ Number of revolutions made by a car wheel $=9$ revolutions per second Number of revolutions made by a car wheel per hour...

Given that, Speed of the car $=66km/h=66000m/h$ Diameter of the wheel $=140cm$ Radius of wheel, $r=140/2=70cm$ Circumference of circle $=2\pi r$ $=2\times 22/7\times 70$ $=440cm$ Circumference of...

Solution: - According to given question, Wheel Diameter $=70cm$ Radius = Half of the diameter of circle $r=d/2$ $r=70/2$ $r=35cm$ Circumference of circle $=2\pi r$ $=2\times 22/7\times 35$ $=220cm$...

Solutions:- According to given question- Wheel Diameter $=1.4m$ Radius = Half of the diameter of circle $r=d/2$ $r=1.4/2$ $r=0.7m$ Circumference of circle $=2\pi r$ $=2\times 22/7\times 0.7$ $=4.4m$...

Area of the circle is $81\pi c{{m}^{2}}$ Area of circle $=\pi {{r}^{2}}$ $81\pi =\pi {{r}^{2}}$ $81\pi /\pi ={{r}^{2}}$ ${{r}^{2}}=81$ $r=\sqrt{81}$ Hence radius is $r=9cm$ Circumference of circle...

Solution: - According to question, Circumference of circular field $=396m$ Circumference of circle $=2\pi r$ $396=2\pi r$ $396=2\times \left( 22/7 \right)\times r$ $r=396\times \left( 7/22...

(iii) According to question, Diameter $=42cm$, angle at the center $={{100}^{\circ }}$ Radius = half of the diameter of the circle $r=d/2$ $r=42/2$ $r=21cm$ Area of the sector $=\left( \pi...

(i) According to question,  Angle at the center $={{60}^{\circ }}$ radius $=4.2cm$, Area of the sector $=\left( \pi {{r}^{2}}\times \frac{\theta }{{{360}^{\circ }}} \right)$ $=\left[ \left(...

(iii) According to question, Diameter of semi-circle, $d=5.6cm$ Radius = half of the diameter of semi-circle $r=d/2$ $r=5.6/2$ $r=2.8cm$ Perimeter of semi-circle $=\left( \pi r+2r \right)$ $=\left[...

(i) According to question, Radius of semi-circle, $r=1.4cm$ Perimeter of  semi-circle $=\left( \pi r+2r \right)$ $=\left[ \left( 22/7 \right)\times \left( 1.4 \right)+\left( 2\times 1.4 \right)...