Geometry and TrigonometryEasyLength of a rectangle from its diagonal and width
Geometry and Trigonometry practice question
A rectangle has a width of 5 centimetres and a diagonal of length 13 centimetres. What is the length of the rectangle, in centimetres?
Answer: 12
The diagonal, width, and length form a right triangle: 13² − 5² = 169 − 25 = 144, and √144 = 12.
Common wrong answers
- If you answered 8
- 8 is 13 − 5.
- If you answered 18
- 18 is 13 + 5.
- If you answered 144
- 144 is the square of the length.
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