Question

Find perimeter of the semicircular region​

Answer 1

Answer:

4. 87.96 yd

5. 47.12 ft

6. 34.56 cm

Step-by-step explanation:

4. diameter(d) = 28 yd,

perimeter = πd = 87.96 yd (rounded to 2 dp)

5. radius(r) = 7.5 ft

perimeter = 2πr = 47.12 ft (rounded to 2 dp)

6. diameter (d) = 11 cm

perimeter = πd = 34.56 cm

Answered by GAUTHMATH

Answer 2

Formula to find the perimeter of a semicircular region:

if radius given: $P=2r$ +  $\pi r$  {r = radius}

if diameter given: $P=d+\pi r$ {d = diameter}

Take $\pi$ as 3.14

Q4.

Diameter = 28 yd

Radius = 28/2 = 14 yd

$P=28+\pi (14)$

$P=28+(3.14)(14)$

$P=28+14.96$

$P=42.96$ yd

Q5.

Radius = 7.5 ft

Diameter = 7.5 × 2 = 15 ft

$P=2(7.5)+\pi (7.5)$

$P=2(7.5)+(3.14)(7.5)$

$P=15+23.55$

$P=38.55$ ft

Q6.

Diameter = 11 cm

Radius = 11/2 = 5.5 cm

$P=11+\pi (5.5)$

$P=11+(3.14)(5.5)$

$P=11+17.27$

$P=17.27$ cm

I hope this helps...

Have a great day ahead :)