Please answer 1-7 thank you so much btw

Answer/Step-by-step explanation:

Formula for the circumference of a circle is:

C = πd,

Where d = diameter

Or

C = 2πr, when r = radius

1. r = 4.5 mm

C = 2*π*4.5

C = 28.3 mm

2. r = 8 in.

C = 2*π*8

C = 50.3 in.

3. d = 21 ft

C = π*21

C = 66.0 ft

5. d = 42 m

C = π*42

C = 131.9 m

6. d = 11 in.

C = π*11

C = 34.6 in.

7. r = 31.5 cm

C = 2*π*31.5

C = 197.9 cm

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet

answer: im sorry i dont get it

step-by-step explanation: