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Answer 1

11. Answer is 169m.

The length from base of the wall till the window = 12m = AB

Distance between the base of the wall and the foot of the ladder = 5m = BC

The length of the ladder = AC

Now,

AC² = AB² + BC² (Pythagoras Theorem)

Therefore,

AC² = (12)²+ (5)²

= 144 + 25

= 169

Therefore,

AC = √(169)

= 13

Therefore the length of the ladder is 13m.

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12. Answer is Sunday 20th July.