Can someone pls help me with this stuff will mark as brainlist

answer:

45 in²

Step-by-step explanation:

So this question is asking you to find the surface area of the pyramid with a square base. To find the total SA of a shape you just have to add up the area of each face.

Let's start with the easier shape first: the square.

To find the area of a square (or rectangle for that matter) you just have to multiply the length and the width. Since its a square the length and width are the same. (3in)

LxW=Area

3x3=Area

9=Area

Now the triangles are not too much harder to do. You just multiply the base and height together and then divide it by 2.

1/2(BxH)=Area

1/2(3x6)=Area

1/2(18)=Area

9=Area

Now comes the easiest part: just adding them up!

(one more thing: you have 4 triangles so you have to add four of them)

Square+ 4Triangle=SA

9+4(9)=SA

9+36=SA

45=SA