What is the length of a chalkboard if its perimeter is 10 m and its width is 20 dm?
| December 16, 2020 | education
If the perimeter of a rectangle is the sum of the length and width multiplied by 2, then to find the length, you need to divide the perimeter by 2 and subtract the width from the quotient.
10m = 100dm
100: 2 = 50 (dm) – the sum of the length and width.
50-20 = 30 (dm) – length.
Check: (30 + 20) * 2 = 50 * 2 = 100dm = 10m
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