Examples, videos, and solutions to help Grade 8 students learn to present informal arguments as to whether or not two triangles are similar and how to find lengths of corresponding sides of similar triangles.
• Students present informal arguments as to whether or not two triangles are similar.
• Students practice finding lengths of corresponding sides of similar triangles.
• Given just one pair of corresponding angles of a triangle as equal, use the side lengths along the given angle to
determine if triangles are in fact similar.
• Given similar triangles, use the fact that ratios of corresponding sides are equal to find any missing measurements.
Example 1 & 2
Given the information provided, is △ ABC ∼ △ DEF?
Given that △ ABC ∼ △ AB'C', could we determine the length of AB'?
If we suppose XY is parallel to X'Y', can we use the information provided to determine if △ OXY ∼ △ OX'Y'?
Given the information provided, is △ OPQ ∼ △ Op'Q'?
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