Geometry

Question 1

Area of a triangle

Answer 1

(B x H) / 2 = Area

Question 2

Area of a rectangle

Answer 2

L x H = Area

Question 3

Area of a trapezoid

Answer 3

((Base1 + Base2) / 2) x H = Area

Question 4

Area of a parallelogram

Answer 4

B x H = Area

Question 5

Area of a rhombus

Answer 5

(Diagonal x Diagonal) / 2 = Area

Question 6

Volume of a rectangular solid

Answer 6

L x W x H = Area

Question 7

Formula for sum of interior angles of a polygon

Answer 7

(n - 2) * 180

Question 8

Three common types of right triangles

Answer 8

1) 3 - 4 - 5 (6,8,9) (9,12,15) (12,16,20)
2) 5 - 12 - 13 (10,24,26)
3) 8 - 15 - 17

Question 9

Ratio of sides for isosceles triangles

Answer 9

45 - 45 - 90
1 : 1 : √2
x : x : √x

Question 10

Ratio of sides for equilateral triangles

Answer 10

30 - 60 - 90
1 : √3 : 2
x : x√3 : 2x

Question 11

Formula for diagonal of a square

Answer 11

d = s√2

Question 12

Formula for diagonal of a cube

Answer 12

d = s√3

Question 13

Ratio of similar triangle side lengths to area ratios

Answer 13

Length - a : b

Area - a² : b²

Question 14

Formula for area of an equilateral triangle

Answer 14

(S²√3) / 4 = Area

Question 15

Circumference of a circle

Answer 15

C = 2πr or C = dπ

Question 16

Area of a circle

Answer 16

A = πr²

Question 17

Surface area of a cylinder

Answer 17

SA = 2 circles + rectangle
SA = 2(πr²) + 2πrh

Question 18

Volume of a cylinder

Answer 18

V = πr²h