(Click the Picture for my question) and thank you!

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Step-by-step explanation:

By definition, π is defined to be the ratio of a circle's circumference to its diameter. In other words:

In fact, if you multiply both sides by the diameter d, you can see that:

Which is the formula for circumference you've been commonly taught.

step-by-step explanation:

given that there are two triangles j'k'l' and jkl>

the former is got by dilating the second one.

when drawn on a grid, (graph paper) coordinates of vertices of first triangle is

(6,12)j, (9,6)k and (12,9)l

side jk has length = distance between j and k

=

side j'k'=distance between j' and k'

=

ie j'k'l' has sides 1/3 of that of corresponding sides of jkl.

hence scale factor of 1/3 is used to get j'k'l'from jkl