Question

Aleena bought a semicircular table cloth which has radius 70 m. She wanted to put lace all around it. How many meters of lace would she has to buy?

Answer 1

Answer:

220m

Step-by-step explanation:

Radius is 70

So, Circumference is 70*22/7*2/2   (/2 because it is semicircle)

220m

She Has to buy 220 m

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Answer 2

Step-by-step explanation:

Radius = 70m

Length of curve of semi-circular table cloth =2πr

= [ 2 × 22/7 × 70 ]m

= [ 2 × 22 × 10 ]m

= 440 m.

Length of the straight side of the semi-circular table cloth = 2 × r

= [ 2 × 70 ]m

= 140 m.

Hence , total length = [ 440 + 140 ]m

= 580 m

Therefore , she will have to buy a lace of length 580 m.