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Ghella [55]
2 years ago
5

I need help asap if u can

Mathematics
1 answer:
jok3333 [9.3K]2 years ago
8 0

Answer:

10π

Step-by-step explanation:

Length of the arc = circumference

Circumference formula = 2πr, for a circle, so for a semicircle, it is just πr

r=10

answer = 10π

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Consider that the initial length and width of the rectangle are given as,

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After the length is increased by 10%, the new length (L) of the rectangle is calculated as,

\begin{gathered} L=(1+\frac{10}{100})\cdot l \\ L=(\frac{110}{100})\cdot20 \\ L=22 \end{gathered}

After the width is decreased by 10%, the new width (B) of the rectangle is calculated as,

\begin{gathered} B=(1-\frac{10}{100})\cdot b \\ B=(\frac{90}{100})\cdot20 \\ B=18 \end{gathered}

Then the area (A) of the new rectangle is calculated as,

\begin{gathered} A=L\times B \\ A=22\times18 \\ A=396 \end{gathered}

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