Question

Please answer answer question

Answer 1

156.6 m²

Explanation:

To find the surface area of this pyramid, we need to find the area of the base and the sides.

The base triangle has a length of 9 and a height of 7.8. So:

`(bh)/(2) = (9\cdot7.8)/(2) = (70.2)/(2) = 35.1`

Now, the length of the sides are 9 and the height is 9. So:

`(9\cdot9)/(2) = (81)/(2) = 40.5`

Since there are 3 identical sides:

`40.5\cdot3=121.5`

Add the values:

`121.5+35.1=156.6`

Hope this helped!