Question

40 POINTS PLS HELP WITH MATH AYÚDAME PORFA

Answer 1

Answer:

7.Circumference of a circle =112.8mm

Diameter =?

Circumference =2πr

112.8=2×3.14×r

112.8=6.28×r

112.8/6.28=r

17.96=18=r

Diameter =2r=2×18=36mm

Therefore the diameter of the circle is 36mm

8.Circumference of a circle =49.6inches

Radius=?

Circumference =2πr

49.6=2×3.14×r

49.6=6.28×r

49.6/6.28=r

7.89=7.90=r

Therefore the radius of the circle is 7.90inches

plz mark it as the brainliest answer

Answer 2

Answer:

7. 35.92 mm   ≅  36 mm

8. 20.06 cm   ≅  20 cm    ( 7.89 inches )

Step-by-step explanation:

7. given:

circumference = 112.8 mm

circumference = $\pi$d     where d = diameter of the circle

$\pi$d = 112.8

d = 112.8 / 3.14

d = 35.92 mm     or     d = 3.592 × 10⁻² m

8. given:

circumference = 49.6 inches

                       = 1.26 m        ( since 1 inch = 0.0254 m )

circumference = 2$\pi$r     where  r= radius of the circle

2$\pi$r = 1.26

r = 1.26/2$\pi$

r = 20.06 cm    or     r = 0.2006  m

Hope it helps !