Answer
Verified
393.5k+ views
Hint: Perimeter of a sector is the total length of the circumference of the circle subtended within the angle\[\theta \]. Perimeter is the sum of the total length of the arc and the two radii.
The length of the arc of a circle is a part of the total circumference of the circle given by$2\pi r$. In the given question, we have to find how much of the total circumference of the circle is subtended by the sector. The formula used for the length of the arc of a circle of radius $r$ and subtending $\theta $ degrees at the center of the circle is${P_{arc}} = 2\pi r \times \left( {\dfrac{\theta }{{360}}} \right)$ . Adding the two radii arm with the length of the arc results in the total perimeter of the sector that is equivalent to ${P_s} = 2\pi r \times \left( {\dfrac{\theta }{{360}}} \right) + 2r$. The formula can be used to determine the perimeter of any part of the circle (for all the sectors of a circle) depending on the angle subtended in the center.
Complete step by step answer:
Substitute $r = 14{\text{ cm}}$ and $\theta = 45$ in the formula ${P_s} = 2\pi r \times \left( {\dfrac{\theta }{{360}}} \right) + 2r$to determine the perimeter of the sector subtending ${45^0}$ of the angle at the center.
$
{P_s} = 2\pi r \times \left( {\dfrac{\theta }{{360}}} \right) + 2r \\
= 2 \times \dfrac{{22}}{7} \times 14 \times \left( {\dfrac{{45}}{{360}}} \right) + 2 \times 14 \\
= 2 \times 22 \times 2 \times \dfrac{1}{8} + 28 \\
= 11 + 28 \\
= 39{\text{ cm}} \\
$
Hence, $39{\text{ cm}}$is the perimeter of the sector subtending ${45^0}$ of the angle at the centre of the circle whose radius is$14{\text{ cm}}$.
Note: Since the sector is just a part of the circle subtending an angle$\theta $ at the center, first find out by what factor of the full circle is covered by the sector using$\left( {\dfrac{\theta }{{360}}} \right)$.
The length of the arc of a circle is a part of the total circumference of the circle given by$2\pi r$. In the given question, we have to find how much of the total circumference of the circle is subtended by the sector. The formula used for the length of the arc of a circle of radius $r$ and subtending $\theta $ degrees at the center of the circle is${P_{arc}} = 2\pi r \times \left( {\dfrac{\theta }{{360}}} \right)$ . Adding the two radii arm with the length of the arc results in the total perimeter of the sector that is equivalent to ${P_s} = 2\pi r \times \left( {\dfrac{\theta }{{360}}} \right) + 2r$. The formula can be used to determine the perimeter of any part of the circle (for all the sectors of a circle) depending on the angle subtended in the center.
Complete step by step answer:
Substitute $r = 14{\text{ cm}}$ and $\theta = 45$ in the formula ${P_s} = 2\pi r \times \left( {\dfrac{\theta }{{360}}} \right) + 2r$to determine the perimeter of the sector subtending ${45^0}$ of the angle at the center.
$
{P_s} = 2\pi r \times \left( {\dfrac{\theta }{{360}}} \right) + 2r \\
= 2 \times \dfrac{{22}}{7} \times 14 \times \left( {\dfrac{{45}}{{360}}} \right) + 2 \times 14 \\
= 2 \times 22 \times 2 \times \dfrac{1}{8} + 28 \\
= 11 + 28 \\
= 39{\text{ cm}} \\
$
Hence, $39{\text{ cm}}$is the perimeter of the sector subtending ${45^0}$ of the angle at the centre of the circle whose radius is$14{\text{ cm}}$.
Note: Since the sector is just a part of the circle subtending an angle$\theta $ at the center, first find out by what factor of the full circle is covered by the sector using$\left( {\dfrac{\theta }{{360}}} \right)$.
Recently Updated Pages
what is the correct chronological order of the following class 10 social science CBSE
Which of the following was not the actual cause for class 10 social science CBSE
Which of the following statements is not correct A class 10 social science CBSE
Which of the following leaders was not present in the class 10 social science CBSE
Garampani Sanctuary is located at A Diphu Assam B Gangtok class 10 social science CBSE
Which one of the following places is not covered by class 10 social science CBSE
Trending doubts
Which are the Top 10 Largest Countries of the World?
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
How do you graph the function fx 4x class 9 maths CBSE
In Indian rupees 1 trillion is equal to how many c class 8 maths CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
Give 10 examples for herbs , shrubs , climbers , creepers
Why is there a time difference of about 5 hours between class 10 social science CBSE
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
What is BLO What is the full form of BLO class 8 social science CBSE