Question

Find the length of an arc of a circle of diameter 20 cm which subtends an angle of 45° at the centre?​

Answer 1

$\huge\underline\mathcal\green{QUESTION}$

Find the length of an arc of a circle of diameter 20 cm which subtends an angle of 45° at the centre?

$\huge\underline\mathcal\red{Answer}$

$length \: of \: arc = 2\pi \: r \frac{theta}{360} \\ = 2 \times \frac{22}{7} \times \frac{42}{2} \times \frac{60}{360} \\ = 22 \: cm$

$\huge\underline\mathcal\purple{BTS \: EXO}$

Answer 2

45×pi /180

pi/4

theta =arc/radius

pi/4= l/10

l= 10pi/4

= 5pi/2

=5×22/2×7

=55/7cm