Question

Help me find the height of this triangular prism?

Answer 1

surface area = area of 3 rectangles + area of the 2 triangles

Answer 2

@welshfella sooo 48.735 = 3(15.12) + 2(???)

Answer 3

yes

Answer 4

@welshfella where do we go from therE?

Answer 5

Find the area of a triangle
then this = 0.5 * 2.7 * height of triangle
solve for height

Answer 6

@welshfella so confused on that part
where did 0.5 come from?

Answer 7

area of triangle = half * base*height

Answer 8

- I don't like fractions - I always use decimals if possible

Answer 9

@welshfella eeeerm i'm completely lost

Answer 10

well work out the area of 2 triangles first
2* A = 48.735 - 3(15.12) = ?

Answer 11

@welshfella
why the 2*A= ????

Answer 12

A = area of one triangle

Answer 13

so 2A = 48.735-45.36 = 3.375
so the area of 1 triangle = 3.375 / 2 = 1.6875

Answer 14

Now using the formula for the area of a triangle

1.6875 = 0.5 * 2.7 * h

where h = height of the triangle ( = height of the prism)

solve for h

Answer 15

@welshfella 1.25???

Answer 16

correct

Answer 17

h = 1.6875 / (0.5*2.7) = 1.25

Answer 18

gotta go - its very late here in the UK
bye!