YEAR 9 - term 3 week 7 revision

scale factor

100

What is the scale factor of these 2 equilateral triangle- 1 has sides of 5cm and the other has sides of 35cm?

scale factor 7

200

Would a scale factor of 1/4 be enlarge, reduce or preserve?

reduce

300

The area of a square is 25cm². After its length and width are enlarged by a scale factor of 3.

What is the area of the new square?

225cm²

400

The area of a rectangle is 50m^2.  after its length (10m)  and width (5m) are reduced by a scale factor of 5.

What is the area of the smaller rectangle? 

2m²

similar triangles

100

For a triangle to be congruent, which rule does this apply to:

AB = DE

<CAB = <FDE

AC = DF

side, angle, side

200

A triangle has a right angle, an angle of 45 degrees and a side of 4.7cm. If it is changed by a scale factor of 5, what is the length of the side in the larger triangle? 

 

23.5cm

300

A building is 8m high and casts a shadow of 3m. If a person is 1.6m tall, what is the size of the shadow that is cast?

0.6m

400

Name the 4 proofs that triangles are congruent.

SSS, SAS, RHS, AAS

index laws

100

y²  x y⁶

y⁸

200

z¹² - z⁵

^{(this is a divided by)}

z⁷

300

(b⁶)⁵

b³⁰

400

b⁰ x b⁰ x b⁵

b⁵

probability

100

What is the Pr(head) when a coin is tossed?

1/2

200

If a bag has 3 green balls, 4 red balls and 2 yellow balls, what is the Pr(green ball)?

1/3

300

In a standard pack of cards, what is the Pr(heart or a 5) being chosen at random? 

16/52  or 4/13

400

Alan and Greg play tennis weekly. Alan usually wins 1 game and Greg wins 3 games. If they play 100 games over a year, how many games would you expect Greg to win? 

75