Question

Please answer answer question

Answer 1

Answer:

156.6 m²

Step-by-step 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:

$\frac{bh}{2} = \frac{9\cdot7.8}{2} = \frac{70.2}{2} = 35.1$

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

$\frac{9\cdot9}{2} = \frac{81}{2} = 40.5$

Since there are 3 identical sides:

$40.5\cdot3=121.5$

Add the values:

$121.5+35.1=156.6$

Hope this helped!