A rectangle cm by cm is enlarged by scale factor . What is the perimeter of the enlarged rectangle?
Answer and explanation
Correct answer: A. 50 cm
- Step 1: New sides: cm and cm.
- Step 2: Perimeter: cm.
Answer
50 cm.
Why not the others: 125 cm: This multiplies the perimeter by , which is the factor for area, not length. 22.5 cm: This adds the scale factor to the original perimeter. 25 cm: This adds only the two new sides and forgets to double.
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