Special Right Triangles
There are two special types of right triangles:
30-60-90  Triangles
60
30

45-45-90  Triangles

45
45
30
Enter the missing angle measures.
45
Which side is opposite the 30 angle?
30º

c

a

60º

b
side a

side b

side c

Which angle is side c opposite?
30º

c

a

60º

b
30

90

45

60

Consider the relationships between the sides in a 30-60-90 right triangle.
30
2
√3
60
1
Consider the relationships between the sides in a 30-60-90 right triangle.
Solve the right triangle by matching the remaining
sides. Look back at the previous slide if helpful.
30º
2
?
√3
?
60º
1
Solve the right triangle by determining the side lengths.
30º
8
?
4√3
?
60º
4
Solve the right triangle by determining the side lengths.
30º
10
5√3
?
60º
5
?
Solve the right triangle by determining the side lengths.
6
?
60º
6√3
?
12
30º
Consider the relationships between the sides in a
45-45-90 right triangle.
Notice that there are two congruent sides and two 
congruent angles.
45º
√2
1
45º
1
Solve the right triangle by determining the side lengths.Look back at the previous slide if helpful.
45º
√2
?
1
45º
1
?
Solve the right triangle by determining the side lengths.
45º
5√2
?
5
45º
5
?
Solve the right triangle by determining the side lengths.
45º
9√2
45º
Solve the right triangle by determining the side lengths.
8
45º
8
?
8√2
?
45º
What is the value of "x", "y" and "z" in the special right triangle?
60
z
y
4√3
y = 
z = 
x = 
What is the value of "x", "y" and "z" in the special right triangle?
y
45º
z
14√2
x = 
y = 
z = 
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