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Mathematics 25 Online
OpenStudy (anonymous):

Medal question

OpenStudy (anonymous):

OpenStudy (anonymous):

@BlankĀ 

OpenStudy (anonymous):

Oops not that one!!

OpenStudy (anonymous):

ganeshie8 (ganeshie8):

Lateral Area = \(\large \text{(Perimeter of base) x (Height)}\)

OpenStudy (anonymous):

15?

ganeshie8 (ganeshie8):

find/figure out the value of perimeter and height, then plugin

ganeshie8 (ganeshie8):

good try, but no

ganeshie8 (ganeshie8):

think of the given shape as a BOX

ganeshie8 (ganeshie8):

base will be the bottom surface of the box, which is just a rectangle of length = 5, width = 12

ganeshie8 (ganeshie8):

Whats the perimeter of rectangle of length = 5, width = 12 ?

OpenStudy (anonymous):

60?

ganeshie8 (ganeshie8):

nope, that wud be area, not perimeter

OpenStudy (anonymous):

Do I need to do l x w? Which I did. 5 x 3 = 15 5 x 7 = 35 3 x 7 = 21 = 71

OpenStudy (anonymous):

Then 71 x 2 = 142

ganeshie8 (ganeshie8):

yes ! and take twice of that cuz u have two sides for each : front = back left = right top = bottom

OpenStudy (anonymous):

It would be 142

OpenStudy (anonymous):

?

ganeshie8 (ganeshie8):

Yep, thats the total surface area

OpenStudy (anonymous):

Okay, I have one more then that's it.

OpenStudy (anonymous):

ganeshie8 (ganeshie8):

start by finding the perimeter of triangular base

ganeshie8 (ganeshie8):

Look at the given diagram - what are the lengths of sides of base triangle ?

OpenStudy (anonymous):

2b+ph is the formula?

ganeshie8 (ganeshie8):

thats the formula for Total surface area, but the question is asking u to just calculate the Lateral area

ganeshie8 (ganeshie8):

Lateral area = ph

ganeshie8 (ganeshie8):

p = perimeter of base

OpenStudy (anonymous):

All I have to do is add them all together?

ganeshie8 (ganeshie8):

yes perimeter of base triangle = 3 + 4 + 5 = 12

ganeshie8 (ganeshie8):

height = 2

ganeshie8 (ganeshie8):

Lateral area = ph = 12*2 = 24

OpenStudy (anonymous):

Oh okay, I get it now.

OpenStudy (anonymous):

Thank you again!

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