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Gaurav Seth 6 years, 3 months ago
Pythagoras Theorem
Statement: In a right angled triangle, the square of the hypotenuse is equal to the sum of squares of the other two sides.
Given: A right triangle ABC right angled at B.
To prove: AC2 = AB2 + BC2
Construction: Draw BD
AC

Proof :
We know that: If a perpendicular is drawn from the vertex of the right angle of a right triangle to the hypotenuse, then triangles on both sides of the perpendicular are similar to the whole triangle and to each other.
ADB 
ABC
So,
(Sides are proportional)
Or, AD.AC = AB2 ... (1)
Also,
BDC 
ABC
So, 
Or, CD. AC = BC2 ... (2)
Adding (1) and (2),
AD. AC + CD. AC = AB2 + BC2
AC (AD + CD) = AB2 + BC2
AC.AC = AB2 + BC2
AC2 = AB2 + BC2
Hence Proved.
OR




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Posted by Sidhant Kumar Dash 6 years, 3 months ago
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Gaurav Seth 6 years, 3 months ago
In Δ ACD
AB = CD = 40 CM
AD=41 CM
∠ACD = 90° ( RECTANGLE HAS 90° ON ALL THE BOTH SIDES)
By Pythagoras theorem
AD² = AC² + CD²
AD² - CD² = AC²
(41)² - (40)² = AC²
1681 - 1600 = 81 = AC²
√81 = AC
AC = 9 CM
Perimeter of Rectangle ABCD = 2 (l+b)
= 2(40 + 9) = 2(49) = 98 CM
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Meghna Thapar 5 years, 10 months ago
The lightning conductor is a thick copper wire or a strip that is secured onto the tallest point of a building to a long copper earth pole that is hammered deep into the ground at the side of the building. It protects buildings from lightning strokes by providing an easier path for the current to flow to earth rather through the building.
Posted by Kalyani Barla 6 years, 3 months ago
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Meghna Thapar 5 years, 10 months ago
The lightning conductor is a thick copper wire or a strip that is secured onto the tallest point of a building to a long copper earth pole that is hammered deep into the ground at the side of the building. It protects buildings from lightning strokes by providing an easier path for the current to flow to earth rather through the building.
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