Practise the method.Example 1Similar triangles have corresponding sides 4cm and 20cm. A second side in the smaller triangle is 4cm. Find its corresponding larger side, in cm.Show worked answerAnswer: 20Scale factor =420=5. Multiply the corresponding side 4 by 5.Example 2Two triangles have equal corresponding angles but different side lengths. What must be true?Show worked answerAnswer: They are similar, but not congruentEqual corresponding angles establish similarity. Different corresponding lengths rule out congruence.Example 3Which information is sufficient to establish congruence of two triangles?Show worked answerAnswer: Two sides and the included angle matchSAS gives congruence when the angle is between the two matching sides.