Question

Can someone help please thank you. please

Answer 1

1. Volume: 912 cm³

Surface Area: 672 cm²

2. Volume: 1239 1/3 cm³

Surface Area: 819 cm²

3. Volume: 216 2/3 cm³

Surface Area: 240 cm²

Explanation:

Formula for Volume of a Pyramid:
`(1)/(3) * lwh`

(where l, w, and h are the length, width, and height, respectively)

Formula for Surface Area of a Square Pyramid:
`B + (1)/(2) ps`

(where B is the area of the base, p is the perimeter of the base, and s is the slant height)

1 (Volume) - V = (1/3)(12)(12)(19)

= (4)(12)(19)

= 912 cm³

1 (Surface Area) - SA = (12)(12) + (1/2)(4)(12)(22)

= 144 + 528

= 672 cm²

2 (Volume) - V = (1/3)(13)(13)(22)

= 1239 1/3 cm³

2 (Surface Area) - SA = (13)(13) + (1/2)(4)(13)(25)

= 169 + 650

= 819 cm²

3 (Volume) - V = (1/3)(10)(10)(6.5)

= 216 2/3 cm³

3 (Surface Area) - SA = (10)(10) + (1/2)(4)(10)(7)

= 100 + 140

= 240 cm²