Question

When creating the formula for surface area of a triangular pyramid
(SA = Zab + 3 (216)), what formula is
being used? (1 point)
•perimeter.
• area of a triangle
• area of a square
• volume

Answer 1

The formula for the surface area of a triangular pyramid \( (SA = \text{Zab} + 3(216)) \) suggests that it involves the areas of the triangular base and the three triangular faces.

- **Zab** appears to represent the area of the triangular base.
- **3(216)** suggests that the areas of the three triangular faces are being calculated. In this case, \( 216 \) may represent the area of each triangular face.

Given these interpretations, the formula is primarily using the **area of a triangle** to calculate the surface area.

So the correct answer is:
- **area of a triangle**.