Question

Find the area and the circumference (or perimeter) of each of the following. (a)a penny; (b) anickel; (c) a dime; (d) a quarter, (e) a half-dollar; (f) a silver dollar; (g) a Sacajawea dollar; (h) adollar bill; and (i) one face of the pyramid on the back of a $1 bill.

Answer 1

You use this for the coins

Area of a circle:

`A=\pi\cdot r^2`

r is the radius and it can be obtaided more easily if you measure the diameter of the circle and then divide it into 2.

Circunference or perimeter of a circle:

`C=2\cdot\pi\cdot r`

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You use this for the bills:

Aera of a rectangle:

`A=l\cdot w`

Perimeter of a rectangle:

`P=2l+2w`

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The face a pyramid has the shape of a trianlge:

Area of a triangle:

`A=(1)/(2)b\cdot h`

Perimeter of a triangle:

`P=b+a+a`