Answer:
28.26 mm
Step-by-step explanation:
The equation used to solve for the area of a circle is;
A=pi x r^2.
The radius is half the diameter, 6mm/2= 3mm.
A= 3.14 x 3^2
3^2= 9
3.14 x 9 = 28.26 mm
or you could just type 3.14 x (3^2) = 28.26mm
13: 72.25
14: 52
For 14, you need to split the figure into a triangle and rectangle.
Answer:
21
Step-by-step explanation:
9+[10+(5-4)x2]
= 9+(10+1x2)
= 9+(10+2)
= 21