MA.8.GR.2.4 · Geometric Reasoning
Similar triangles have equal angles and proportional sides, which is what makes shadow, mirror, and other indirect measurement problems work. 8th graders set up a proportion between corresponding sides and solve for the unknown length.
FAST items are real-world multiple choice and equation editor questions built on a diagram of two triangles. Pairing the wrong corresponding sides is the main trap, so students line the triangles up by their equal angles before writing the proportion.
These come straight from Algebro's 8th grade pre-algebra question bank, easiest first. Answer one, check it, then move to the next.
Answer it and Algebro checks it instantly
Showcase extra: the real practice and quiz players do not have this button.
Correct answer: C. 33 ft
Select every answer that applies, then check.
Showcase extra: the real practice and quiz players do not have this button.
Correct answer: A, B, D (highlighted above)
Enter the number only. Do not include units like $, %, or ft²
Showcase extra: the real practice and quiz players do not have this button.
Correct answer:
Pick one match in each row, then check.
| 0.4 | 5 | 1.5 | |
|---|---|---|---|
| 3 units → 15 units | |||
| 4 units → 6 units | |||
| 10 units → 4 units |
Showcase extra: the real practice and quiz players do not have this button.
Correct answer: shown by the green boxes above
Showcase extra: the real practice and quiz players do not have this button.
Correct answer: A. 6 yd
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