Congruency & Similarity
What does similar mean?
The same shape but rotated, enlarged, reflected or translated
What does Scale Factor mean?
The multiplier of enlargement
How many angles on a straight line?
180
When 3x + y = 14, what is Y when x = 4
Circle C has radius 12cm. Circle X has radius 24cm. Are they similar?
Yes - there is a scale factor of 2
If something is enlarged, does it always get bigger?
No, it can be a fraction or decimal and get smaller
How many angles in a regular 4 sided shape?
360
What is the name for the length of a circle?
Diameter
Rectangle A has length 40 and width 60
Rectangle B has length 60 and width 80. Are they congruent?
No
If Line A is 24cm and it is enlarged by scale factor 1/3, how big will it become?
8cm
X and Y are two angles that make a straight line. X is 102, what is Y?
78
360
What does congruent mean?
The same shape and same size
Rectangle X is 5cm x 15cm
Rectangle Y is 1cm x 3cm. What is the scale factor from Y to X?
3
A triangle has angles 80 and 23. What is the other angle?
77
What does every odd number have?
The letter e in it
Triangle A has 40, 60 and 80 as interior angles, what must Triangle B have to be similar?
40, 60 and 80 as interior angles
Triangle G has sides 4cm, 5cm and 8cm. Triangle H has sides 20cm, 25cm and 40cm. What is the scale factor from H to G?
1/10
An isosceles triangle has an angle of 94, what are the other two angles?
43
How long have humans been doing maths?
30,000BC according to markings on animal bones