A sector of a circle of radius 10.5 cm subten...
A sector of a circle of radius 10.5 cm subtends an angle of 45° at the centre of the circle as in adjoining figure. Find the perimeter of sector.
• a)
37.25 cm
• b)
36 cm
• c)
21.25 cm
• d)
29.25 cm

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 Environment Lover Feb 27, 2019
Related A sector of a circle of radius 10.5 cm subtends an angle of 45° at the centre of the circle as in adjoining figure. Find the perimeter of sector.a)37.25 cmb)36 cmc)21.25 cmd)29.25 cmCorrect answer is option 'D'. Can you explain this answer?

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 Nagita Sindhard Jan 04, 2019
Perimeter of sector=2×radius+length of arc. and length of arc=theta÷360×2

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 Moshim Kapoor Feb 27, 2019
Related A sector of a circle of radius 10.5 cm subtends an angle of 45° at the centre of the circle as in adjoining figure. Find the perimeter of sector.a)37.25 cmb)36 cmc)21.25 cmd)29.25 cmCorrect answer is option 'D'. Can you explain this answer?
Perimeter of sector =2r + length of the Arc.
length of arc= angle /360×2πr
=45/360×2×22/7×10.5
=1/8×2×22×1.5
=66/8
=8.25
perimeter of sector=8.25+21
=29.25

 Pardeep Singh Jan 04, 2019
Perimeter of sector =2r+l
L=length of arc
length of arc=theta/360*2πr
=45/360*2*22/7*105/10
=8.25
area of sector= 2(10.5)+8.25
=29.25cm

Question Description
Solutions for A sector of a circle of radius 10.5 cm subtends an angle of 45° at the centre of the circle as in adjoining figure. Find the perimeter of sector.a)37.25 cmb)36 cmc)21.25 cmd)29.25 cmCorrect answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 10. Download more important topics, notes, lectures and mock test series for Class 10 Exam by signing up for free.