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Varun

· started a discussion

· 1 Months ago

shame on you (Question: 95646.0 )

correct answer is 544
taking slant height and height as same i.e 12cm
shame !!!!!!

Question:
A rectangle based pyramid, length and width of the base are 18cm and 10cm respectively. Find the total surface area, if its height is 12cm.
Options:
A) 267 cm2
B) 568 cm2
C) 580 cm2
D) None of these
Solution:

Ans (c):


 


Given that,


Height, PU=QX=RV=WS= 12 cm

Length, AB=DC=18 cm

Width, AD=BC=10 cm


Now,


Total Surface Area = Area of Rectangle ABCD + 2(Area of triangle BRC) + 2(Area of triangle DSC)


= 18x10 + 2(\(\cfrac{1}{2}\times BC \times RV\)) + 2(\(\cfrac{1}{2}\times DC \times WS\))

=180+ 13x10 + 18x15

=180+130+270

=580

Abhishek Gautam

· commented

· 1 Months ago

how can u take slant height and height same ... slant height will be different when we will find according to length it will come13 and when we will calculate according to breadth it will come 15 ... as shown in the solution ..

Arti

· commented

· 1 Months ago

516 is correct

Knowledge Expert

· commented

· 1 Months ago

@Varun

its ok....

Team TR

Varun

· commented

· 1 Months ago

564 is the correct answer
i beg your pardon
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