A rectangular screen is 9 cm wide and 12 cm high. What is the length of its diagonal?
Answer and explanation
Correct answer: C. 15 cm
- Step 1: The diagonal is the hypotenuse of a right triangle: cm. Answer: 15 cm. Why not the others: 21 cm: adds the sides. 225 cm: forgets the square root. 42 cm: gives the perimeter.
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