Posted by **Jerald** on Wednesday, March 6, 2013 at 6:12pm.

The triangle below has a height of 12 feet and a base of 9 feet. What is the area of the triangle?

A.108

B.54

C.21

D.30

B?

If the area of a square is 81 square meters which formula would you use to calculate the perimeter of the square?

A.p=lxw

B.p=s+s

C.p=4(s)

D.Not here

C?

The circumference of this circle is approximately 66 inches. What is the radius?

A.33

B.22

C.11

D.Not here

D?

- Math -
**Ms. Sue**, Wednesday, March 6, 2013 at 6:17pm
The first two are correct. Your last one isn't right.

C = pi * d

- Math -
**Jerald**, Wednesday, March 6, 2013 at 6:20pm
I don't know the diameter.

- Math -
**Ms. Sue**, Wednesday, March 6, 2013 at 6:24pm
But you do know the circumference. And you know the value of pi.

- Math -
**Jerald**, Wednesday, March 6, 2013 at 6:28pm
Oh. Because I was using the formula radius=C/2 pi

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