This whole problem is only about a circle. Let's not get confused by the rest of the lampshade.
The circumference of any circle is (pi) times (the diameter) .
For this circle, it's (pi) times (13 cm).
They told us what to use for (pi), so it's (3.14) x (13 cm) = 40.82 cm
and that's all there is to it.
The circumference of the base of the lampshade, using the formula C = π × d , is calculated as 40.82 cm and rounded to 40.8 cm .
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Jawaban:ga ada angka awalnya, jadi ga bisa di kerjain kak