5.
Find the area of blue portion of the irregular shape to the right. Round your answer to the nearest tenth.

2.7 in²
9.7 in²
3.4 in²
8.3 in²

Question

5.  
Find the area of blue portion of the irregular shape to the right. Round your answer to the nearest tenth.

    2.7 in²
    9.7 in²
    3.4 in²
    8.3 in²

anonymous · Answer

attachment

jtvatsim · Answer

think of the question like this...

You have a square cookie, and then you take a circular bite out of the middle.

The cookie that's left after the bite is the blue area.

So, you need to do Area of square - Area of circle = Area of weird shape

stamp · Answer

$$A_{blue}=A_{square}-A_{circle}$$$$A_{square}=s^2$$$$A_{circle}=\pi r^2$$

anonymous · Answer

Thats kind of confusing......

anonymous · Answer

I still cannot figure it out. Please help!

jim_thompson5910 · Answer

What do you get for the area of the square?

anonymous · Answer

I don't know how to get the area of the square because its not telling me the side. I know the radius is 2 and the diameter is 4, but then what? What do i multiply?

jim_thompson5910 · Answer

|dw:1360369620399:dw|

jim_thompson5910 · Answer

oops it got cut off, it should say

side of square = 4

anonymous · Answer

okay, side of square is 4...... so then do i ultiply it by 2 to get the area, which would be 8?

jim_thompson5910 · Answer

no, you square it

Area of square = 4^2 = 4*4 = 16 square units

jim_thompson5910 · Answer

now use this formula to find the area of the circle

A = pi*r^2

anonymous · Answer

okay so "r" would be 16 right

jim_thompson5910 · Answer

r would be 2

jim_thompson5910 · Answer

r = radius

anonymous · Answer

oops.....sorry! I am so bad at this! So is the area 12.56?

jim_thompson5910 · Answer

yep

jim_thompson5910 · Answer

now subtract the two

anonymous · Answer

I subtract 12.56 and what?

jim_thompson5910 · Answer

that from the area of the square (16)

jim_thompson5910 · Answer

Area of square - Area of circle  = 16 - 12.56 = ???

anonymous · Answer

okay so the answer is 3.44

jim_thompson5910 · Answer

you got it

jim_thompson5910 · Answer

and you round that to get 3.4

anonymous · Answer

but thats not one of the answer choices.....

jim_thompson5910 · Answer

you have to round to the nearest tenth like they want

anonymous · Answer

o ya sorry!

anonymous · Answer

forgot that! Can you help me on one more please!

jim_thompson5910 · Answer

its fine, besides even if it was off a bit, you can't always get the exact area with an approximation

so that's why getting really close is good enough in my book

anonymous · Answer

3.  
Find the area for the given circle. Round to the nearest tenth.

    113.0 ft²
    124.8 ft²
    37.7 ft²
    452.2 ft²

anonymous · Answer

attachment

jim_thompson5910 · Answer

diameter = 12 ft

radius = 6 ft  (cut the diameter in half)

jim_thompson5910 · Answer

so r = 6

anonymous · Answer

okay so its C = pi x r x 2

jim_thompson5910 · Answer

they want the area, not the circumference

jim_thompson5910 · Answer

so use A = pi*r^2

anonymous · Answer

A = 3.14 x 6 x 2
   = 113.04?

anonymous · Answer

when you multiply the two, does it mean to multiply 6 by 6 or 6 by 2

jim_thompson5910 · Answer

round to the nearest tenth

anonymous · Answer

o so its 113.0

jim_thompson5910 · Answer

6^2 means that you square 6

so 6^2 = 6*6 = 36

jim_thompson5910 · Answer

yes

anonymous · Answer

okay cool. ummmmmm.... am i wasting ur time or ca i do 2 more? Then i promise thats it!

jim_thompson5910 · Answer

you're not as long as you're learning something

anonymous · Answer

i am finnally getting it i think hold on let me post the problem...

anonymous · Answer

1.  
Find the area of the given circle. Round to the nearest tenth.

    22.0 cm²
    38.5 cm²
    11.0 cm²
    42.8 cm²

anonymous · Answer

attachment

anonymous · Answer

A = pi*r^2
   = 3.14 x 3.5 x 2

jim_thompson5910 · Answer

use ^ instead of x