If Lara's company pays 75% then she pays 25%. So the total she pays in 1 year (annual) of her premium is:
$6,009.00 * 0.25 = $1502.25
So, each month she pays 1/12 of that amount or:
$1502.25 / 12 = $125.1875 or rounded to nearest penny $125.19
Assuming that it means triangle types. I believe a right triangle could be made, depending on the placement of that 51 degree angle, but even then im not sure. Is there more to the question that you left out? Such as options.