Question

Please help me idk this

Answer 1

82.5

Explanation:

I'm assuming you have to find the area of the triangle to find out how much cardboard she needs so you need the formula:

A =
`(1)/(2)`bh

A =
`(1)/(2)` 11 x 15

A =
`(1)/(2)` 165

A = 82.5

Sorry if its wrong