Question

if the diameter of a semi-circular protractor is 4cm, find its perimeter.​

Answer 1

Answer:

12.57 cm circumference

Answer 2

≈

10.283cm

Answer:

Explanation:

perimeter

=

1

2

π

d

+

4

that is the semi circle plus diameter

×

×

×

=

(

1

2

×

π

×

4

)

+

4

×

×

×

=

2

π

+

4

≈

10.283

cm to 3 dec. places