What's the lateral area of the following pyramid? : 129.6 cm² 172.8 cm² 86.4 cm² 259.2 cm²

129.6 cm²

Step-by-step explanation:

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

step-by-step explanation:

1. 8

2. 9

3. 20

4. 3

5. 17

6. 2.2

7. 11.25

8. 1

9. 14

10. 2

step-by-step explanation:

thats the first half