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Question: Find the length of the unknown side, correct to 1 decimal place if necessary.



A ) 6.3 cm
B ) 4.5 cm
C ) 3.8 cm
D ) 5.5 cm

Steps to derive

1 We can find the length of the unknown side of the right-angled triangle, using Pythagoras′ theorem.

2 The square of the hypotenuse is equal to the sum of the squares of the other two sides.
t2 = 22 + 62
 [Pythagoras′ theorem]

3 t2 = 4 + 36 = 40
 [22 = 4 and 62 = 36]

4 t = 40
 [Take square root on both sides.]

5 Hence, t = 6.3 cm



Hence the right answer is Option A

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