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lisabon 2012 [21]
3 years ago
11

What is the area of the given composite figure, using 3.14 for π. Round to the nearest tenth. (*Hint- find the area of the recta

ngle and semi-circle then add them together)
Question 1 options:

187.9 cm²


356.9 cm²


433.9 cm²


110.9 cm²

Mathematics
2 answers:
QveST [7]3 years ago
8 0

Answer:

356.9 cm² is the answer.

Step-by-step explanation:

The area of the figure can be derived by adding the area of the rectangle and the area of half circle or semicircle.

Length of rectangle = 20 cm

Width of rectangle = 14 cm

So, area is = 20\times14=280 cm square

Now for semicircle, the radius will be = \frac{14}{2}=7 cm

The area can be found as : \frac{1}{2}\pi r^{2}

= \frac{1}{2}(3.14\times7\times7)

= 76.93 cm square

Now adding both the areas, we get the complete area of the figure.

Total area = 280+76.93=356.93 cm square ≈ 356.9 cm square.

Illusion [34]3 years ago
6 0

The area of the rectangular part = 14 x 20 = 280 sq. cm

The area of the half circle = 1/2 (3.14 x 7^2) = 76.9 sq. cm.


Total area = 280 + 76.93 = 356.9 cm^2



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