alleryStart learning →A triangle has two sides of 6 cm and 9 cm and a perimeter of 21 cm. How long is the third side?
A15 cm
B4 cm
C21 cm
D6 cm
Answer & Solution
Correct answer: D. 6 cm
The two known sides add to 15 cm, and 21 - 15 leaves 6 cm.
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