শূন্যস্থান পূরণ করো
The length of a chord of a circle can be found if we know the radius and the .
If the radius of the circle is 7 cm and the central angle is $90^\circ$, the chord length is $2 imes 7 imes \sin(45^\circ)$ = .
In a circle with radius 5 cm, the circumference is $2\pi imes 5 = $ .
A circle with diameter 12 cm has a circumference of $\pi \times$ .
The formula to calculate the circumference of a circle is $C = 2\pi imes$ .
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