Download 7-3:Triangles Warm-up What is an ​ Acute Triangle​? What is a

7-3:Triangles
Warm-up
Real-World Link
Page 555
What is an ​
Acute
Triangle​
?
An ​
acute triangle
have all acute
angles.
What is a ​
Right
Triangle​
?
A​
right triangle ​
has
1 right angle.
What is an ​
Obtuse
Triangle​
?
An ​
obtuse triangle
has 1 obtuse angle.
What is a ​
Scalene
Triangle​
?
A ​
scalene triangle
has no congruent
sides.
What
is
an
Isosceles Triangle​
?
An
isosceles
​
triangle h​as at least
two
congruent
sides.
What
is
Equilateral
Triangle​
?
An
equilateral
​
triangle
has
​
3
congruent sides.
an
Summary:
What is a ​
Triangle​
?
What
Congruent
Segments​
?
Example 1a:
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Example 2b:
Page 557
A ​
triangle ​
is a
figure with three
sides and three
angles.
are
Sides with the same
length
are
congruent
segments​
.
Draw a triangle that
satisfies the set of
conditions below.
Then classify the
triangle.
a) A triangle with
one right angle and
two
congruent
sides.
Classify the triangle
shown by its angles
and sides.
Angles
of
Triangle​
:
Example 3c:
Page 557
Summary:
a
x + y + z = 180°
In ABC, if
m A = 25° and
m B = 108°,
what is the m C
?
∠
∠
∠
The sum of the
measures of the
angles of a triangle
is 180°