Answer:
129.6 is the one
Explanation:
129.6 cm²
The lateral area (A) is the area of the 4 congruent triangular faces.
A = 4 × bh ( b is the base and h the perpendicular height )
Here b = 8 and h = 8.1 , thus
A = 4 × × 8 × 8.1 = 2 × 8 × 8.1 = 16 × 8.1 = 129.6 cm²
6.5m questions
8.6m answers
bh ( b is the base and h the perpendicular height ) × 8 × 8.1 = 2 × 8 × 8.1 = 16 × 8.1 = 129.6 cm²