
Plane Figures 
Triangle 


Solving the right triangle 
Equilateral
and Isosceles Triangle

Equilateral
triangle

Isosceles
triangle






Solving
the right triangle 
To solve a right triangle means to find all unknown sides and angles using its
known parts. 
While solving a right triangle we use
Pythagoras’ theorem and trigonometric functions of an
acute angle depending
which pair of its parts is given. 
Note, right triangles are usually denoted as
follows; c stands for the hypotenuse,
a
and b
for the perpendicular sides called legs, and a and
b
for the angles opposite to a
and b
respectively. 
There are four basic cases that can occur,
given 
a) hypotenuse and
angle, c) hypotenuse and leg, 
b) leg and
angle,
d) two legs. 


Equilateral
and Isosceles Triangle

Equilateral
triangle



Isosceles
triangle










Beginning
Algebra Contents D 



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