A triangular pane of glass has a height of 30 inches and an area of 270 square inches. what is the length of the base pane

The equation for the area of a triangle is A = b*h / 2. So, plug in your known variables, and you get 270in^2 = b*30 / 2. First you multiply by 2 to cancel out the division for 2, which gets you 540 = b * 30. To get "b" by itself, divide both sides by 30, giving you 18=b.

To check this, plug in your new known variable, as 270 = 18 * 30 / 2. This will equal as 270=270, confirming 18in as the correct measurement.