Question

how do you find the surface area of a triangle?

Answer 1

oh sorry, i mean pyramid

Answer 2

When all side faces are the same:

[Base Area] + 1/2 × Perimeter × [Slant Length]

Answer 3

When side faces are different:

[Base Area] + [Lateral Area]

Answer 4

The Surface Area has two parts: the area of the base (the Base Area), and the area of the side faces (the Lateral Area).

For Base Area :

It depends on the shape, there are different formulas for triangle, square, etc. See Area for formulas, or our Area Calculation Tool

For Lateral Area :

When all the side faces are the same:

Just multiply the perimeter by the "slant length" and divide by 2. This is because the side faces are always triangles and the triangle formula is "base times height divided by 2"
But if the side faces are different (such as an "irregular" pyramid) then add up the area of each triangular shape to find the total lateral area.

Answer 5

what about this?

Answer 6

@CGGURUMANJUNATH

Answer 7

When all side faces are the same:

[Base Area] + 1/2 × Perimeter × [Slant Length]

Answer 8

i got 22.61

Answer 9

so we see that base is square and hence base area =side*side = 1.7*1.7mm^2 and perimeter of square =4*side^2=4*1.7mm and slant length=2.9mm
there fore we get the surface area of pyramid given=1.7*1.7+(1/2)*1.7*4*2.9=1.7*1.7+2*1.7*2.9=2.89+9.86=12.75mm^2

Answer 10

i got 22.61 show me your steps.

Answer 11

is the dought clear or not ?

Answer 12

the base is not triangle here don't get confused here it is square pyramid.