learning task 2 complete the table by solving the surface area of the following solid figure use the back page of for your solution
please @Katie89 stop reporting and deleting my questions that are not nonsense please, and don't delete this question again, @Kwonhana worked hard to answer this question and you just delete it? And you deleted Questions that are not nonsense or nothing is wrong with the question, im confused.
please @Katie89 stop reporting and deleting my questions that are not nonsense please, and don't delete this question again, @Kwonhana worked hard to answer this question and you just delete it? And you deleted Questions that are not nonsense or nothing is wrong with the question, im confused.
Answers & Comments
Answered again by: Kwonhana 권한아
April 23rd 2022
1. find the SA (surface area) of the cylinder
Radius = 3, Height = 4
SA = 2πr² + 2πrh
SA = 2π(3)² + 2π(3)(4)
SA = 2π(3)(3) + 2π(12)
SA = 2π(9) + 24π
SA = 18π + 24
SA = 42π
SA = 42(3.14159265359)
SA = 131.946891451
SA = 131.95 cm²
2. find the SA of the sphere (4 circles = sphere)
Radius = 5
SA = 4πr²
SA = 4π(5)²
SA = 4π(5)(5)
SA = 4π(25)
SA = 100π
SA = 100(3.14159265359)
SA = 314.159265359
SA = 314.16 m²
3. find the SA of the rectangular prism
Height = 2, Width = 1, Length = 5
SA = 2(L x H) + 2(W x H) + 2(L x W)
SA = 2(5 x 2) + 2(1 x 2) + 2(5 x 1)
SA = 2(10) + 2(2) + 2(5)
SA = 20 + 4 + 10
SA = 34 m²
4. find the SA of the cube (6 squares = Cube)
Square = 9
SA = 6s²
SA = 6(9)²
SA = 6(9)(9)
SA = 6(81)
SA = 486 cm²
5. find the SA of the triangular prism
SA = 3(L x B) + 2(B x H x 0.5)
SA = 3(11 x 4) + 2(4 x 3 x 0.5)
SA = 3(44) + 2(12 x 0.5)
SA = 132 + 2(6)
SA = 132 + 12
SA = 144 mm²
Learn More!
SA = Surface Area
"π" was called pi, π = 3.14159265359,
r = radius
h = height
Circle (2d) = πr²
why I put the number first before the π? because typically, when you have something in terms of π like a Number times π (N x π), you put the number first
π12 = x
12π = √
Learn more about cylinder, cone, and sphere
Cylinder = 2πr² + 2πrh
why? because the rectangle of cylinder is 2πrh
and the top and bottom of cylinder is πr²
(Top = πr², Bottom = πr²)
Cylinder = Top + Bottom
Cylinder = πr² + πr²
Cylinder = 2πr²
Cone = πr² + πrh
why? because the lateral area of cone is πrh
and the base (circle) of the cone is πr²
Sphere = 4πr²
why? because the area of circle (2nd dimension shape or 2d) is πr² and to make a sphere (3rd dimension figure or 3d), you need 4 circles
example:
sphere = 4 Area of circles
sphere = πr² + πr² + πr² + πr²
sphere = 4πr²
Rounding of to the nearest hundredths
rounding of to the nearest hundredths, you learned it right? if not, I'll give you the example:
45.65801
Tens = 4
Ones = 5
Decimal = .
Tenths = 6
Hundredths = 5
Thousandths = 8
Ten Thousandths = 0
Hundred Thousandths = 1
rounding of to the nearest hundredths
45.65801
= 45.66 why? look next to the hundredths, if its 5-9, add 1 to the hundredths (12.359 = 12.36) and if its 0-4, its still the same (16.323 = 16.32)
Do you want to ask something? ask it in the comment section!
Ah dinilete din yung sayo? akin din eh
iniwarn pa ako, same den tayo ng question eh.
How to solve this problem?
to solve this problem, first, we need Many people to help us solve this, but many of us hates @Katie89 and others right? cause she/he's deleting questions for no reason, right? so all you have to do is Rate brainly in 1 star, and
comment this:
"I rate this 1 star because in Brainly.ph, there are bot's who deleted our questions or answers for no reason at all, like @Katie89, @EmeraldsInHerEyes and @CarloD009, they keep deleting our questions or answers for NO REASON. please administrator, fix this."
and that's it or mention the other bot's who's deleting questions and answers for no reason I only know is @Katie89, @EmeraldsInHerEyes, and @CarloD009. if there are more bot's who's deleting our questions and answers for no reason, add it in your comment and no im not talking about the comment section in Brainly I'm talking about what to comment in "What's the reason why you rated brainly in 1 star"