Question

Find the length of tape required to cover the boundary of a semicircular disc of diameter 42 cm

Answer 1

Answer:

Step-by-step explanation:

D= 42

r =21

Now, length of the boundary= 2πr

= 2(22/7)(21)

=42(22/7)

=22(6)

=132

Answer 2

Heya mate

Here's your answer

⬇️⬇️⬇️

$<b>As we all know that we have to find a the circumference of the semi-circle.......</b>$

Let find the radius of the semi-circle = $\huge\frac{42}{2}$ cm

= 21 cm

➡️Tape required to cover the boundary of a semicircular disc (Circumference of the semi-circle) = $\pi$r

= $\huge\frac{22}{7}$ × 21 cm

= 22 × 3 cm = 66cm

$<HR>$

$\therefore$ Tape of length 66 cm is needed to cover the boundary of a semicircular disc.........

$<b><i><u>$Hope it helps you mate ✌✌

be brainly ✌✌

keep asking ✌✌

thanks for asking this question ✌✌