[Sharjah]

1) Determine the area and circumference of a circle with radius 8 cm.
Use π key on your calculator so the answer is as accurate as possible.
Round your answer to the nearest hundredth as needed.

2) Determine the perimeter and area of the shape shown below.
https://i.imgur.com/GW2zn3f.png

3) Determine the perimeter and area of the shape shown below. (Both rounded regions are semicircles.)
https://i.imgur.com/fFAFzMY.png

4) Find the volume of a cylinder with radius of 3 inches and height 7 inches.


5) Find the volume of a sphere with radius 8 meters is

[GroveStreetOG]

1)
Area of a circle is r
circumference of a circle is 2πr

2)
You can split that up to 2 shapes, a right triangle and a rectangle

3)
EDITED, I AM VERY UNSURE ABOUT THIS PART OF THE QUESTION.
Spoiler (Click to View)Perimeter of a circle is its circumference, So there are 2 semi circles that are about the exact same size, so since we're looking at half the circle only, Circumference of a semi circle = πr, but since there are 2 of them, its 2πr.
Add that onto the perimeter of a square which is just 2L.
For area, same concept, area of 1 semi circle is r/2, then for 2 semi circles its a whole circle which is just r. So area of that whole shape is r + l*w (l*w is the area of a square/rectangle)
4)
Volume of a cylinder:
V=πr^2h
=π*(3^2)*(2*7)

5)
Volume of a sphere:
V = (4/3)πr^3
=(4/3)π(8^3)

I dont have a calculation handy so just enter the numbers =P

[THC]

snippy

Dang it. Looks right. Was looking forward to a bit of a challenge :P

[mattdax]

What math is this? If i recall correctly I did all this stuff in my grade 8 exam. Used to love geometry such easy stuff.

[Elkabeer]

1)
Area of a circle is r
circumference of a circle is 2πr

2)
You can split that up to 2 shapes, a right triangle and a rectangle

3)
EDITED, I AM VERY UNSURE ABOUT THIS PART OF THE QUESTION.
Spoiler (Click to View)Perimeter of a circle is its circumference, So there are 2 semi circles that are about the exact same size, so since we're looking at half the circle only, Circumference of a semi circle = πr, but since there are 2 of them, its 2πr.
Add that onto the perimeter of a square which is just 2L.
For area, same concept, area of 1 semi circle is r/2, then for 2 semi circles its a whole circle which is just r. So area of that whole shape is r + l*w (l*w is the area of a square/rectangle)
4)
Volume of a cylinder:
V=πr^2h
=π*(3^2)*(2*7)

5)
Volume of a sphere:
V = (4/3)πr^3
=(4/3)π(8^3)

I dont have a calculation handy so just enter the numbers =P