Question

Please answer the above question.
Correct answer will be marked as brainliest.​

Answer 1

Answer:

please mark as brainlist

Step-by-step explanation:

21cm

Answer 2

Answer:

Hence the correct answer is option (A)4m

Step-by-step explanation:

Given,

A table cloth with a length 63cm with scalloped edges made of semicircles.

To find,

The length of the lace is required to fix along the scalloped edges.

Recall the formula,

The perimeter of a circle = 2πr, where 'r' is the radius of the circle

Solution

Length of the lace required = Total length of the scalloped edges

Since the scalloped edges consist of 12 semicircles, the total length of the scalloped edges is equal to the sum of the perimeters of 12 semicircles.

Since, the semicircles are identical and each side has 3 semicircles,

we have the diameter of a semicircle = $\frac{63}{3}$ = 21cm

Radius of the semicircles = $\frac{21}{2}$cm

Perimeter of a semicircle = πr = $\frac{22}{7} X\frac{21}{2}$ = 33cm

Perimeter of the 12 semicircles = 12×33= 396cm

Hence the total length of the scalloped edges = 396cm

∴The total length of the lace required = 396cm = 3.96m ≈4m

Hence the correct answer is option (A)4m

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