D=6.3 mm caculate the area of the circle.

Hello!

The area of a circle is given using the formula: A = πr².

Given that the diameter is 6.3 millimeters, we need to find the radius. Remember, the radius of a circle is half the diameter.

R = 6.3 / 2 = 3.15 millimeters

With the radius, we can substitute the values into the formula and solve.

A = π(3.15)²

A = 9.9225π

A = 9.92π (not multiplying by π), 31.17 (multiplied by π), 31.16 (multiplied by 3.14)

Therefore, the area of the circle is about 31.17 millimeters squared.

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

happy to

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