Question

. Please answer the question

Answer 1

Given inner diameter d = 3 3/4

                                        = 15/4.


Then the radius r = 1/2 * diameter

                              = 1/2 * 15/4

                              = 15/8cm.


Given thickness = 5/7cm.


Therefore the outer radius of the pipe = 15/8 + 5/7

                                                                 = 145/56.

                                                                 = $2 \frac{33}{56} cm$



Hope this helps!

Answer 2

$= \frac{15}{8} + \frac{5}{7} \\ = \frac{105 + 40}{56} \\ = \frac{145}{56} = 2.58cm$