Triangles

Triangle

→Sum of 3 angles in triangle is always equal to 180°

1. Area of triangle

= Area = ½ X Base X Height

right angle triangle

Right angled triangle

→In this type of triangle one of the angle is 90°
1. Area of right angled triangle = ½ X Base X Perpendicular

2. (Hypotenuse)2 = (Perpendicular) 2 + (Base) 2

30°, 60°, 90° Triangle

1. Side opposite to 30° angle = ½ X Hypotenuse 

2. Side opposite to 60° angle = √3/2 X Hypotenuse 

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isosceles
triangle

Isosceles Triangle 

→ A triangle in which opposite sides have equal lengths is called Isosceles triangle 

1. Area of Isosceles Triangle = 

Where a= length of opposite sides and c = length of remaining side 

Isosceles right triangle

1. Area of isosceles right triangle = ½ X a2

2. Perimeter = √2 X a X (√2 + 1)

Hypotenuse isosceles right triangle = √2 X congruent side

equilateral triangle

Equilateral triangle

→In this all 3 sides are of equal length and all 3 angles are 60° each

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