25 POINTS PLS HELPPP WITH MATH

1. 23.55 in

2. 102.36 mm

Step-by-step explanation:

The circumference of a circle is calculated by the formula: , where d is the diameter and r is the radius.

We can use this to answer both problems.

1. Since the diameter is 7.5 inches, then d = 7.5. Substitute this into the equation: . So, the circumference is 23.55 inches.

2. Here, the radius is 16.3 mm, so r = 16.3. Substitute this into the equation: . So, the circumference is 102.36 mm.

Hope this helps!

1) 23.55 inches

2) 102.36 mm

Step-by-step explanation:

C = pi × d

1) C = 3.14 × 7.5

= 23.55

C = 2 × pi × r

2) C = 2 × 3.14 × 16.3

= 102.364 mm

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6