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3 years ago

3) A semicircle is attached to the side of a rectangle as shown.

Mathematics

2 answers:

mojhsa [17]3 years ago

5 0

Answer:

Option C $122.1\ cm^{2}$

Step-by-step explanation:

we know that

The area of the figure is equal to the area of a rectangle plus the area of semicircle

Step 1

Find the area of the rectangle

The area of the rectangle is equal to

$A=bh$

we have

$b=18\ cm$

$h=6\ cm$

substitute

$A=18*6=108\ cm^{2}$

Step 2

Find the area of semicircle

The area of semicircle is equal to

$A=\frac{1}{2}\pi r^{2}$

we have

$r=6/2=3\ m$

substitute

$A=\frac{1}{2}(3.14)(3^{2})=14.1\ cm^{2}$

Step 3

Find the area of the figure

$108\ cm^{2}+14.1\ cm^{2}=122.1\ cm^{2}$

m_a_m_a [10]3 years ago

3 0

Rectangle = 18 x 6 = 108
Circle: 3.14 x (3)^2 = 3.14 x 9 = 28.26
semicircle: 28.26 / 2 = 14.13

108 + 14.13 = 122.13

answer
122.13 cm^2

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