Constructions
1. Copy Segment
2. Copy Angle
3. Bisect Segment (perpendicular)
4. Bisect Angle
Warm Up
Find the value of x and list the sides of triangle ABC in order
from shortest to longest. (Hint: Find the angle measures
first then decide which side is the shortest.)
m<A = 5x + 2
m<B = 6x - 10
m<C = x + 20
Quiz Review 4.2, 4.4, 4.6
Isosceles Triangle Theorem
Constructions
Equilateral Triangles
Triangle Midsegment Theorem
Proving Midsegment Theorem
** Bonus points for not
using the formula sheet!
Triangle Inequality Theorem
Angle­Side Relationships in Triangles
<C,<B,<A
DE, EF, DF
5<x<29
N0
Yes
<B, <A
No
No
No
NO
<F, <E
ST
TU
Find x.
Find y.
7
90°
y
Find x.
50°
Find x.
6
50°
8
60°
Find m < 2.
62°
Find m < 2.
34°
Find x.
12
12
Find x.
10
10
Find x.
6.5
4
60°
65°
115°
55°
120°
60°