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aperez4102
04.08.2020 •
Mathematics
Hi there,
I need help to solve the perimeter and the surface area of this shape.
Thanks!
Solved
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Ответ:
Perimeter = 6π ≈ 18.84
Area = 15π ≈ 47.10
Step-by-step explanation:
This is a composite of a big semicircle with diameter of 10 --> radius (r) = 5
plus a medium semicircle with diameter of 6 --> r = 3
minus a small semicircle with diameter of 4 --> r = 2
Perimeter of a semicircle =![\dfrac{1}{2}(2\pi r)=\pi r](/tpl/images/0717/0522/4f5e3.png)
Area of a semicircle =![\dfrac{1}{2}(\pi r^2)](/tpl/images/0717/0522/25f77.png)
Ответ:
help
Explanation:
plz