The radius of a circle whose circumference is equal to the sum of the circumferences of the two circles of diameters 36 cm and 20 cm is
A. 56 cm
B. 42 cm
C. 28 cm
D. 16 cm
Answer:C
The radius of a circle whose circumference is equal to the sum of the circumferences of the two circles of diameters 36 cm and 20 cm is
A. 56 cm B. 42 cm C. 28 cm D. 16 cm
Explanation: If the sum of the circumferences of two circles with radii R1 and R2 is equal to the circumference of a circle of radius R, then R1 + R2 = R.