Question

Did I solve these questions correctly?
Here's the questions:
http://s1324.beta.photobucket.com/user/Marcelia1/media/Mathsucks.png.html?sort=3&o=1

Here's my answers:

1( A=15ft
P= 18ft

2( A=8m
P=11m

3( A= 81in
P= 27in

4( SA= 980yd
V= 2260yd

5( SA= 190cm
V= 126cm

6( SA= 726mm
V= 1331mm

A stands for area. P stands for Perimeter. SA stands for surface volume. V stands for volume. Just so there is no confusion :)

Answer 1

For 1)
your perimeter looks good, but You want to double check the area

Answer 2

# 1 both look good

Answer 3

Ok thanks :) How's #2?

Answer 4

oh just a silly side note, but the units for area are square units.

So A=15ft should be A=15ft^2 (to denote "square feet")

Answer 5

the area in #2 is incorrect

Answer 6

the perimeter in #2 is correct

Answer 7

3) area is incorrect

the perimeter is correct only if you are rounding to the nearest integer

Answer 8

Ok how would I find the area for #2? I was'nt sure because I think its a pythagorean shape

Answer 9

The area of each triangle is

A = (bh)/2

A = (3*2)/2

A = 3

Since there are 2 triangles, the triangles add to an area of 3+3 = 6 square meters

The area of the inner rectangle is 0.5*3 = 1.5

So in total, the area of the composite figure is 6+1.5 = 7.5 square meters.

Answer 10

now that I think about it, if you round to the nearest integer, then you would get 8 square meters

Answer 11

Oh ok so rounded to the nearest tenth, I would be right?

Answer 12

7.5 rounded to the nearest tenth does not give you 8.0 or 8