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Anni [7]
3 years ago
15

PLS HELP ME.

Mathematics
1 answer:
andrey2020 [161]3 years ago
8 0

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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