Need help for ixl, really hard

[next prism]

we need to find the surface area of the triangle

for that, we need the base area

this is our base, the equilateral triangle

it's really easy to calculate its area, (bh)/2

(15 . 13)/2

can you tell me what that would be?

no problem

alright. we got our base area

lets see our formula: B + (Ps)/2

our base is 97.5, our base perimeter we can find by doing 15+15+15 (that would be 45) and our slant height is 10

so: 97.5 + (45 . 10)/2

are you following?

[next prism]

can you calculate that for us?

neat! so thats the answer

in square inches

i'm here if you need any further help. if you don't have any more questions, you can close the channel by typing ".close"