Base (b)
8 units
Perp. height (h)
5 units
Step 1 — Write the formulaArea = base × height
Step 2 — Put the numbers inArea = 8 × 5
Step 3 — Work it outArea = 40 square units
sq units
The base is the brass edge along the bottom; the height is the mustard dashed line that goes straight up (perpendicular), not along the slanted side. Multiply base by height — same trick as a rectangle.