Question

If the perimeter of a semi - circular protector is 66cm , the diameter of the protector is:

Answer 1

Answer:

answer will be 42 cm

Step-by-step explanation:

circumference circumference or perimeter of a circle is= 2 Pi R

and this is semi circular so its circumference or perimeter will be = Pi R

piR =66

R=7x66/22=21 cm

R=2x diameter

so 21x 2=42

hence diameter of protector is 42 CM

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Answer 2

Answer:

perimeter of circle is

$2\pir$

perimeter of semicircle is

$\pir$

$\pir = 66 \\ r = 66 \div 3.14 = 21.019$

diameter= 2r

= 2×21.019= 42.038 cm