Checkbox Question
The lengths of two sides of a triangle are 20 mm and 15 mm. Which of these lengths cannot represent the length of the third side.
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✓
40
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×
30
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×
20
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×
15
Answer
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\because 40 > 20 + 15 = 35
\therefore 40 is not the third side of the triangle
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\because 30 < 20 + 15 = 35
\therefore 30 is the third side of the triangle
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\because 20 < 20 + 15 = 35
\therefore 20 is the third side of the triangle
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\because 15 < 20 + 15 = 35
\therefore 10 is the third side of the triangle