Find the circumference of the circle .the diameter is 6cm

6π cm

Step-by-step explanation: To find the circumference of the circle, start with the formula for the circumference of a circle which is shown below.

Circumference = πd

Since we are given that the diameter of the circle is 6 centimeters,

we can plug a 6 in for the diameter in our formula and we have

(π)(6 cm) which is 6π cm.

So the circumference of this circle is 6π cm.

a. she will receive a refund of $278.

step-by-step explanation:

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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