Unit 1 : Pythagoras, Trig ratios, Sine and Cosine rule and area od shapes

Question 1

Pythagoras theory

Answer 1

a^2 + b^2 = c^2

Question 2

Tan

Answer 2

opposite/adjacent

Question 3

Cos

Answer 3

adjacent/hypotenuse

Question 4

Sin

Answer 4

opposite/hypotenuse

Question 5

Sine rule

Answer 5

a/SinA = b/SinB = c/SinC

Question 6

What is the sum of exterior angles of any triangle

Answer 6

The sum of 2 opposite interior angles

Question 7

What is the sum of interior angles of any triangle

Answer 7

180°

Question 8

Trapezium

Answer 8

has one pair of parallel sides

Question 9

What is the sum of the interior angles of a parallelogram?

Answer 9

360°

Question 10

Interior angles of a polygon

Answer 10

(n - 2) x 180
(n = the number of sides the polygon has)

Question 11

The sum of the exterior angles of a polygon

Answer 11

360°

Question 12

Area of a kite

Answer 12

1/2 (product of diagonals)

Question 13

Area of trapezium

Answer 13

(sum of parallel sides) x height /2

Question 14

Area of prism

Answer 14

Area of cross section x length

Question 15

Volume of a cone

Answer 15

1/3 x π x r^2 x h

Question 16

Curved surface area

Answer 16

π x r x l
(l = height of the slant)

Question 17

Area of a pyramid

Answer 17

Area of base x height / 3

Question 18

Volume of sphere

Answer 18

4/3 x π x r^3

Question 19

Area of a non-right angles triangle

Answer 19

1/2 x ab SinC OR 1/2 x ac SinB OR 1/2 x bc SinA