Geometry

Question 1

Circumference of a circle

Answer 1

2πr

Question 2

Diameter of a circle

Answer 2

2r

Question 3

Area of a circle

Answer 3

πr^2

Question 4

Area of a square

Answer 4

S^2

Question 5

Perimeter of a square

Answer 5

4s

Question 6

Area of a rectangle

Answer 6

LW

Question 7

Perimeter of a rectangle

Answer 7

2L + 2W

Question 8

Special angles

Answer 8

5. 12. 13
3  4   5
7 24 25
8 15 17
9 40 41
11 60 61

Question 9

Area of triangle

Answer 9

1/2 bh

Question 10

Area of triangle with one angle and 2 sides

Answer 10

1/2 absinc

Question 11

Area of triangle with 3 sides

Answer 11

S=a+b+c/2

A=√s(s-a)(s-b)(s-c)

Question 12

Rule of similar triangles

Answer 12

When you have 2 similar triangles equate their sides dividing.e.g x/y = b/z

Question 13

In a triangle: Convert 45° side to 90° side

And 90° side to 45° side

Answer 13

45° side to 90° side= side 45°× √2

90° side to 45° side= side 45°÷ √2

Question 14

2 Qualities of a iscoceles triangle

Answer 14

Has a 45° angle

All sides are equal

Question 15

Primary angle of a square

Answer 15

90°

Question 16

In a triangle,convert: 30° side to 90° side

90° side to 30° side

Answer 16

90° to 30°(sides)= 90° side ÷ 2

30° to 90° side=30° side × 2

Question 17

In a triangle: convert 30° side to 60° side

convert 60° side to 30° side

Answer 17

30° side to 60° side = 30° side × √3

60° side to 30° side = 60° side ÷ √3

Question 18

Area of a sector

Answer 18

Theta/360 ×πr^2

Question 19

Arc length of a sector

Answer 19

Theta/360 × 2πr

Question 20

Area of a trapezoid

Answer 20

1/2(b1 + b2)h

Question 21

Area of a parallelogram

Answer 21

B×h

Question 22

Qualities of a rhombus

Answer 22

Opposite angles are equal

The angles always Add up to 360°

Question 23

Perimeter of a rhombus

Answer 23

4s

Question 24

Area of a rhombus

Answer 24

1/2(d1)(d2)

D is the addition of opposite sides in the rhombus

Question 25

Surface area of a sphere

Answer 25

4πr^2

Question 26

Volume of a sphere

Answer 26

4\3 πr^3

Question 27

Volume of a rectangular prism

Answer 27

Lwh

Question 28

Surface area if rectangular prism

Answer 28

2lw + 2wh +2lh

Question 29

Distance of a rectangular prism

Answer 29

√l^2 + w^2 + h^2

Question 30

Volume of a Cube

Answer 30

V= x^3

Question 31

Surface of a cube

Answer 31

6x^2

Question 32

Length of the longest diagonal of a cube

Answer 32

√3x^2

Question 33

Volume of a cylinder

Answer 33

πr^2h

Question 34

Lateral area of cylinder

Answer 34

2πrh

Question 35

Surface area of a cylinder

Answer 35

2πrh + 2πr ^2

Question 36

Volume of a cone

Answer 36

1/3 πr^h

Question 37

Lateral area of a cone

Answer 37

πr

Question 38

Surface area of a cone

Answer 38

πrl +πr^2

Question 39

A^2 +2AB+ B^2

Answer 39

(A+B)^2

Question 40

A^2 - 2AB +B^2

Answer 40

(A-B)^2

Question 41

Area of a circular sector

Answer 41

1/2 theta r^2