D: {1,2,3,4}
R: {1,2,3,4}
Function? Yes, the relation is a function.
1. A pentagonal pyramid has 6 faces, 10 edges, and 6 vertices
2. The polygons you would need to construct a pentagonal pyramid are a triangular or rectangular pyramid. Or probably just a triangle and a pentagon (I’m not sure, hope I helped)
Answer: 
<u>Step-by-step explanation:</u>

4 * (25 * 1.2) = (4 * 25) * 1.2
Answer:
<u>384 cm²</u>
Step-by-step explanation:
Property of rhombus :
- Diagonals of rhombus bisect each other and are perpendicular to each other
Given :
- Rhombus ABCD and its diagonals AC and BD bisect each other at O
- AC ⊥ BD
- AB = BC = CD = DA = 20 cm
- AC = 24 cm
Solving :
Area of the given rhombus is twice the Area of ΔABC formed by the given diagonal and two adjacent sides.
- 2 × 1/2 × OB × AC
- 24 × OB
- 24 × √AB² - AO²
- 24 × √20² - (AC/2)²
- 24 × √400 - 144
- 24 × √256
- 24 × 16
- <u>384 cm²</u>