1 answer:
Step-by-step explanation:
v.of cylinder= (pi)r²h
pi used = 22/7
first cylinder (A)= 22/7 x 5² x 7
= 550 cm3
second (B) = 22/7 x 10² x 5
=1571.43 cm3
A + B = 2121.43 cm3
new cylinder:
22/7 x r² x 3= 2121.43 cm3
r² = √2121.43/ (22/7 x 3)
r = 15 cm
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