math qn. no.1…?
How far from the wall must you place a ladder of length 12m, if the ladder is to touch a point 10m above the ground?
thanx guys!
Favorite Answer
12^2 – 10^2 = C^2
144-100 = C^2
44 = C^2
C= square root of 44
1)Draw a straight line and label it 10m because that is the distance from the ground to the point 10 meters high
2)Draw the ladder leaning from the top of the ten meter line to the ground. We know this is 12 meters because we were given the length of the ladder.
3) Finally complete the triangle by drawing a horizontal line connecting the two others. This is the line measuring the distance from the wall.
We have a horizontal and vertical line in this triangle that make a 90 degree angle so it must be a right triangle. Therefore we can use the pythagorean theorum to solve it.
if a^2+b^2=c^2
we know c is the hypotenuse and that would be our ladder so thats 12 meters
lets say the one we’re solving for is “a”
and therefore make b 10 meters
plug them in and get a^2+(10)^2=(12)^2
solve for a^2 and take the square root.
(12*12)-(10*10)=144-100
=44
Distance from the ladder to the wall=square root of 44
c = 12
a = 10
find b:
12^2 = 10^2 + b^2
144 = 100 + b^2
44 = b^2
b = 6.63 m
x^2 = 144 – 100
X^2 = 44
x = sqrt (44)
x = 6.63325