Question

A ladder is 10m long and is leaning on a wall.Its foot is 5cm away from the wall.Find the angle it mxed with the ground

Answer 1

by Pythagoras theorem
let the sides be a,b,c
therefore:
ac
${ac}^{2} = {ab}^{2} + {bc}^{2}$

${10 }^{2} = {ab}^{2} + {5}^{2}$
${ab}^{2} = 100 - 25$
ab^2=75
ab=√75
ab=√25×3
ab=5√3
therefore right angle is mixed with the ground