a 15 m long ladder reaches a window 12 high from rhe ground on placing it agaist ladder from the wall
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By Pythagoras Theorem,
Pythagoras theorem states that for any right angled triangle, the area of the square on the hypotenuse is equal to the sum of the areas of square on the legs.
∵ RQ is the hypotenuse,
152 = 122 + a²
225 = 144 + a²
By transposing 144 from RHS to LHS it becomes – 144
a²= 225 – 144
a² = 81
a = √81
a = 9 m
∴ The length of a = 9 m
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