Practice Problems (Junior Cert Mathematics): Flashcards

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AA Similarity Theorem statement

2 angles equal → triangles similar

Corresponding sides in similar triangles

Are proportional

Parallel lines in triangle effect

Create proportional segments

Triangle Proportionality Theorem

Line || side → divides other sides proportionally

Solving ab=cd\frac{a}{b} = \frac{c}{d}

Cross-multiply: ad=bcad = bc

Why equal angles prove similarity

AA Similarity Theorem

What to match in similar triangles

Corresponding sides

If 7y=812\frac{7}{y} = \frac{8}{12}, value of yy

y=10.5y = 10.5

If 6x=812\frac{6}{x} = \frac{8}{12}, value of xx

x=9x = 9

Similar triangles shape property

Same shape, angles equal, sides proportional

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