3. Find the formula to get the
circumferences and areas of
the following shaded area
a cm
1. Given that a square that length
of width is a cm, how to find
circumference and areas of
shaded area ?
4. 2. Given that a
square that
length of width
is a cm, how to
find
circumferences
and areas of
shaded area ?
5. 3. Given that two
circles like
beside ficture,
and then the
length of OB is a
cm, and the
length of OA is b
cm how to find
circumferences
and areas of
shaded area ?
6. 4. Given that a
square
that
length of width
is a cm, how to
find
circumference
and areas of
shaded area ?