1.
Which figure is an isosceles triangle?
A.
B.
C.
D.
Hint
2.
Triangle
RST
is isosceles with
as the vertex angle. If
ST
= 3
x
- 11,
SR
=
x
+ 3, and
RT
=
x
- 2, find
RT
.
A.
5
B.
14
C.
7
D.
9
Hint
3.
Which figure is an obtuse triangle?
A.
B.
C.
D.
Hint
4.
Which statement is not true?
A.
In an isosceles triangle, the base is congruent to one of the legs.
B.
A triangle can be obtuse and isosceles.
C.
A triangle cannot be obtuse and contain a 90° angle.
D.
A triangle cannot be scalene and isosceles.
Hint
5.
ABC is ______.
A.
scalene and acute
B.
isosceles and scalene
C.
equilateral
D.
scalene but not acute
Hint