Find the radius of a circle whose circumference is equal to the sum of the circumferences of two circles of radii 15 cm and 8cm . NCERT Class X Mathematics - Exemplar Problems Chapter _AREA RELATED TO CIRCLES
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here,r1=15, r2=8, r3= ?
2πr3=2πr1+2πr2
2πr3=2π(r1+r2)
r3=r1+r2
r3=15+8
r3=23
Therefore,the radius of a circle is 23cm
2πr3=2πr1+2πr2
2πr3=2π(r1+r2)
r3=r1+r2
r3=15+8
r3=23
Therefore,the radius of a circle is 23cm
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