[size=3]Hello, ogglock!

1) Given a semicircle with 2 congruent semicircles inside of it.

The diameter of the large semicircle is 9.2 cm.

Find the area of the shaded region. Code:

..* * *..
*:::::::::::*
*:::::::::::::::*
*:::::::::::::::::*
:::* *:::::::* *:::
** *:* **
* - -+- - * - -+- - *
: - 4.6 - : 2.3: 2.3:
: - - - 9.2 - - - :

The radius of the large semicircle is 4.6 cm.

The radii of the small semicircles is 2.3 cm.

Can you find the difference of the areas?

Given a square with side 12.4 cm.

Four congruent circles are inscribed in the square.

Find the area of the shaded region. Code:

: - - - - 12.4 - - - - :
*---*-*-*-------*-*-*---*
|:* *:::* *:|
|* *:* *|
| |
* + * + *
| |
|* *:* *|
|:* *:::* *:|
|:::* * *:::::::* * *:::|
|:* *:::* *:|
|* *:* *|
| |
* + * + *
| |
|* *:* *|
|:* *:::* *:|
*---*-*-*-------*-*-*---*
: 3.1 : 3.1 : 3.1 : 3.1 :

The side of the square is 12.4 cm.

Can't you see that the radius of the circles is 3.1 cm?