Skills Practice - Deerlake Middle School

NAME DATE PERIOD
4-6
Skills Practice
Isosceles and Equilateral Triangles
Refer to the figure at the right.
1. If −− AC −−− AD , name two congruent angles.
2. If −−− BE −−− BC , name two congruent angles.
3. If ∠EBA ∠EAB, name two congruent segments.
A
B
E
C
D
Lesson 4-6
4. If ∠CED ∠CDE, name two congruent segments.
Find each measure.
5. m∠ABC 6. m∠EDF
40°
60°
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
ALGEBRA Find the value of each variable.
7.
2x+4 3x-10
9. PROOF Write a two-column proof.
Given: CD −−− CG
−−−
−−−
DE GF
−−−
Prove: CE −−− CF
−−
8.
(2x+3)°
C
D
E
F
G
Chapter 4 39 Glencoe Geometry

NAME DATE PERIOD
4-6
Practice
Isosceles and Equilateral Triangles
Refer to the figure at the right.
1. If −−− RV −− RT , name two congruent angles.
2. If −− RS −− SV , name two congruent angles.
V
S
R
U
T
3. If ∠SRT ∠STR, name two congruent segments.
4. If ∠STV ∠SVT, name two congruent segments.
Find each measure.
50°
5. m∠KML 6. m∠HMG 7. m∠GHM
8. If m∠HJM = 145, find m∠MHJ.
9. If m∠G = 67, find m∠GHM.
10. PROOF Write a two-column proof.
Given: DE −−− ‖ BC
−−−
∠1 ∠2
Prove: AB −− AC
−−
11. SPORTS A pennant for the sports teams at Lincoln High
School is in the shape of an isosceles triangle. If the measure
of the vertex angle is 18°, find the measure of each base angle.
A
2
E
1
D
C
3
4
B
Lincoln Hawks
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Chapter 4 40 Glencoe Geometry