Similarity
what is the formula for scale factor?
Image side length / object side length
Two triangles both have sides 3 cm, 4 cm and 5 cm. Congruent or not?
Congruent
What is this shape?
Parallelogram
Two triangles have all 3 corresponding sides equal. What rule proves congruence?
AAA
4
What is the scale factor from triangle 1 to triangle 2?
One triangle has sides 3, 4, 5. Another has sides 6, 8, 10. Congruent, similar or neither?
Similar
What is the value of x?
20
Two triangles have all three corresponding sides equal. Which condition do they satisfy?
SSS
What do angles in a triangle add to?
180º
Calculate the value of h
h=6
Two triangles have the same three angles. Are they definitely congruent?
What is the missing angle?
70º
Two sides and the included angle are equal. Name the congruence rule.
SAS
What is the longest side of a right-angles triangle called?
Hypotenuse
Calculate the value of y
Triangle A has sides 5, 7, 8. Triangle B has sides 5, 7, 8 but is rotated. Are they congruent? Explain
Yes. Congruency is maintained through transformations such as rotation.
What does this symbol mean?
lines are parallel
Two right-angled triangles have equal hypotenuses and one matching side. Name the rule.
RHS
What are three types of triangles?
iscoceles, scalene, equilateral
What rule proves similarity but not congruency?
AAA
Two triangles have sides 5 cm and 8 cm and an angle of 40°. Is that enough to guarantee congruence? Explain.
Yes. This satisfies the SAS congruency condition
Which rule proves these angles are equal?
the Z rule (alternate angles)
Two triangles have angles 50° and 70° and the side between these angles is 6 cm in both. Which rule proves congruence?
ASA
Make two similar triangles using two sticky notes
fold one in half once.
fold the other in half twice.