Answer:
(A) Take half the area of the whole circle.
Step-by-step explanation:
A semi-circle is half of a circle, thus the area of circle is given by:'
Area of circle=
, where r is the radius of the circle.
Since, A semi-circle is half of a circle, therefore area of the semi circle is also half of the circle, therefore
Area of semi circle=
Thus, the area of the semi circle can be found by taking half the area of the whole circle.
Circumference = 2Pi * r
28.3cm = 2pi * r ( Isolate r )
28.3cm / 2pi = r
R = 4.504
To verify work we can plug 4.504 back into the equations.
Circumference = 2pi*4.504 ~ 28.299 Which is true !
Answer:
Step-by-step explanation:
12 x 6s - 8 x 4s = 72s - 32s = 40s