12.1-12.3

Question 1

Lateral faces

Answer 1

Faces that are not bases

Question 2

Surface area

Answer 2

The sum of the areas of the faces

Question 3

Net

Answer 3

2D representation of a 3D shape

Question 4

Oblique prism

Answer 4

Lateral edges are not perpendicular to bases

Question 5

Lateral edges

Answer 5

Segments that connect vertices of lateral faces to bases

Question 6

Lateral area

Answer 6

Sum of the areas of the lateral faces

Question 7

Right prism

Answer 7

Lateral edge is perpendicular to both bases

Question 8

Cylinder

Answer 8

A solid with congruent circular bases

Question 9

Polyhedron

Answer 9

A solid that is bounded by polygons which are called faces

Question 10

Regular polygon

Answer 10

All faces are congruent

Question 11

Convex polyhedron

Answer 11

None of the faces are concave (inward )

Question 12

Platonic solids

Answer 12

Regular polyhedrons cube(6), tetrahedron (4), octahedron (8), dodecahedron(12), icosahedron (20)

Question 13

Euler’s theorem

Answer 13

F+V = E+ 2

Question 14

Cross section

Answer 14

Intersection of plain and solid

Question 15

Rectangular prism SA

Answer 15

2B + Ph
B= area of base
P= perimeter
H is height

Question 16

Triangular prism SA

Answer 16

2B + Ph

Base = triangular

Question 17

Cylinder SA

Answer 17

2 pie r squared + 2 pie r h

Question 18

Regular Pyramid SA

Answer 18

B + Pl/2

Question 19

Cone SA

Answer 19

Pie r squared + pie r l

Question 20

Sphere SA

Answer 20

4 pie r squared

Question 21

Right cone lateral area

Answer 21

Pie r l