Find perimeter of the semicircular region​

Formula to find the perimeter of a semicircular region:

if radius given: +    {r = radius}

if diameter given: {d = diameter}

Take as 3.14

Q4.

Diameter = 28 yd

Radius = 28/2 = 14 yd

yd

Q5.

Radius = 7.5 ft

Diameter = 7.5 × 2 = 15 ft

ft

Q6.

Diameter = 11 cm

Radius = 11/2 = 5.5 cm

cm

I hope this helps...

Have a great day ahead :)

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

10 down (bang1)

5 up

5down (2)

2.5 up

2.5 down (3)

1.25 up

1.25 down (4)

now add them up : )

hoped i lol