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Measurement (Length) — 25-Question Test
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Key Concepts — Quick Reference
This chapter
Unit conversions (the metric ladder)
| km to m | 1 km = 1000 m |
|---|---|
| m to cm | 1 m = 100 cm |
| cm to mm | 1 cm = 10 mm |
| Larger to smaller | Multiply (km->m x1000, m->cm x100, cm->mm x10) |
| Smaller to larger | Divide (mm->cm /10, cm->m /100, m->km /1000) |
Perimeter formulas
| Rectangle | Perimeter = 2 x (length + breadth) = 2(l + b) |
|---|---|
| Square | Perimeter = 4 x side = 4a |
| Triangle | Perimeter = a + b + c (sum of three sides) |
| Equilateral triangle | Perimeter = 3 x side = 3a |
| Regular polygon | Perimeter = number of sides x length of one side = n x s |