Geometry and Measurement
Use perimeter, area, angle facts, and unit conversions quickly and accurately.
Geometry and Measurement
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Know what the question is measuring
Perimeter is the distance around a shape.
Area is the amount of space inside a flat shape.
Perimeter = 2L + 2W
Area = L × W
Use IDENTIFY → FORMULA → UNIT
- IDENTIFY: Is the problem asking for perimeter, area, angle, or measurement?
- FORMULA: Use only the formula you need.
- UNIT: Check cm vs cm², m vs m², minutes vs hours, and so on.
- REASON: Ask whether your answer is the right size.
Six patterns you should recognize
1. Rectangle perimeter
Length 8 cm, width 5 cm.
2(8) + 2(5) = 26 cm2. Rectangle area
Length 9 m, width 4 m.
9 × 4 = 36 m²3. Triangle area
Base 10 cm, height 6 cm.
1/2 × 10 × 6 = 30 cm²4. Angle fact
Angles on a straight line add to 180°. If one angle is 125°, the other is:
180 − 125 = 55°5. Unit conversion
3.5 m = ? cm
3.5 × 100 = 350 cm6. Time conversion
2.5 hours = ? minutes
2.5 × 60 = 150 minutesPerimeter or area?
A rectangular garden is 12 m long and 7 m wide. How much fencing is needed to go around it?
- Fencing goes around the garden.
- So we need perimeter.
- 2(12)+2(7)=24+14.
Watch out for these
Around means perimeter.
Area uses cm², m², and so on.
The height must be perpendicular to the base.
1 m = 100 cm, so meters to centimeters gets larger.
Build the skill
These mix perimeter, area, angles, and measurement conversions.
Can you choose the right formula fast?
Five short questions. Decide what is being measured before calculating.
Can you do it without hints?
Score 5/5 to verify this competency. If you miss one, a fresh set will be ready.
Geometry formulas getting mixed up?
Send Teacher Abi the problem that confused you and your result. I can help you identify what the question is actually measuring.
Message Teacher AbiChoose your next step
Next competency: Patterns, Sequences, and Number Relationships
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