Question

the perimeter of a semi - circle protractor is 32.5 cm. Calculate the radius of the protractor (in cm).

Answer 1

hello mate,
we know that perimeter of circle is 2πr
so, perimeter of semi circle protractor=2πr/2=πr
so, it's perimeter =32.5 cm
πr=32.5 cm
22/7*r=32.5 cm
r=32.5*7/22=10.34 cm (approx)

hope helped and plz mark it..

Answer 2

hey mate here's ur answer

let radius of protractor be x cm

given perimeter of protractor = 32.5 cm

but we know that perimeter of semicircle = πr

=> πr = 32.5

=> 3.14r = 32.5

=> r = 32.5/3.14

=> r ≈ 10.35



so, radius of protractor ≈ 10.35 cm