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Shape [tex]\( A \)[/tex] is a circle with radius [tex]\(\frac{\sqrt{17}}{2} \text{ cm}\)[/tex].

Shape [tex]\( B \)[/tex] is a sector of a circle with radius [tex]\(5 \text{ cm}\)[/tex].

Which shape has the greater area, [tex]\( A \)[/tex] or [tex]\( B \)[/tex]?

Sagot :

To determine which shape has the greater area, we need to calculate the area of each shape.

Shape A:

Shape A is a circle with a radius [tex]\(\frac{\sqrt{17}}{2}\)[/tex] cm. The formula for the area of a circle is:
[tex]\[ \text{Area} = \pi r^2 \][/tex]
where [tex]\(r\)[/tex] is the radius.

For Shape A:
[tex]\[ r = \frac{\sqrt{17}}{2} \][/tex]

Substituting this into the formula for the area:
[tex]\[ \text{Area}_A = \pi \left(\frac{\sqrt{17}}{2}\right)^2 \][/tex]

Calculating the radius squared:
[tex]\[ \left(\frac{\sqrt{17}}{2}\right)^2 = \frac{17}{4} \][/tex]

Then, substituting back into the area formula:
[tex]\[ \text{Area}_A = \pi \cdot \frac{17}{4} = \frac{17\pi}{4} \][/tex]

Numerically, this area is approximately:
[tex]\[ \text{Area}_A \approx 13.35 \, \text{cm}^2 \][/tex]

Shape B:

Shape B is a sector of a circle with radius 5 cm. Since no additional details are provided about the angle of the sector, we'll assume Shape B is a full circle.

The formula for the area of a circle is again:
[tex]\[ \text{Area} = \pi r^2 \][/tex]
where [tex]\(r\)[/tex] is the radius.

For Shape B:
[tex]\[ r = 5 \, \text{cm} \][/tex]

Substituting this into the formula for the area:
[tex]\[ \text{Area}_B = \pi (5)^2 = 25\pi \][/tex]

Numerically, this area is approximately:
[tex]\[ \text{Area}_B \approx 78.54 \, \text{cm}^2 \][/tex]

Comparison:

[tex]\[ \text{Area}_A \approx 13.35 \, \text{cm}^2 \][/tex]
[tex]\[ \text{Area}_B \approx 78.54 \, \text{cm}^2 \][/tex]

Since [tex]\(78.54 \, \text{cm}^2 > 13.35 \, \text{cm}^2\)[/tex], we conclude that Shape B has the greater area.

Therefore, Shape B has the greater area.
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