Question

all 4 questions...... plzz help
or any if u know....... ♥ ♥

Answer 1

1) radius of first circle=15
Therefore circumference is 2pi(15)=30pi
radius of second circle=18
Therefore its circumference=2pi(18)=36pi
Total sum of circumferences of two circles=30pi+36pi=66pi or 2pi(33) as 66/2=33 . Therfore the radius of required circle is 33cm.