Question

if the perimeter of a semicirclur protractor is 36 cm then ffind its dimeter

Answer 1

Answer:

14cm (rounded)

Step-by-step explanation:

Lets say diameter is D.

For the semicircle its perimeter is D+0.5Dπ=36 since circumference is Dπ and it is half of this added to the flat edge (D).

This can be factorised into D(1+0.5π)=36.

From here you just divide both sides by (1+0.5π) and this is the diameter.

Hope this helps.

Answer 2

Answer:

diameter =14 cm

Step-by-step explanation:

perimeter of semicircular protractor= 36 cm πr+2r=36 cm (π+2)r= 36 cm (22÷7+2)r= 36 cm 36/7 r= 36 cm. r=36×7/36 ( r=7) diameter =2r =2×7=14cm