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This question is to be done by Pythagorean Theorem,(H²=P²+B²).
GIVEN, Height of wall is the height covered by Ladder tip= AC= 12m (PERPENDICULAR)
Distance between foot and wall= BC = 5m(Base)
To find -height of ladder
Thus, using Pythagorean Theorem,
H²=P²+B²
=> (AB)² = (AC)² + (BC)2
= (12m)² + (5m)²
= 144m²+25m²
= 169m²
Thus, AB= 13m
Therefore, height/lenght of ladder is 13m.
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