Practice with Triangles
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Answer the following questions regarding triangles:

1. In triangle ABC, m<A = 48º, and m<C = 24º.   What type of triangle is triangle ABC ?
 
acute
right
obtuse

 

 

2. The angles of a triangle are in the ratio of 1:3:5.  Find the measure of the largest angle of the triangle.
 
100º
60º
20º

 

 

3. The vertex angle of an isosceles triangle measures eight times the measure of a base angle.  Find the measure of a base angle.
18º
36º
144º

 

 

4. In triangle DEF, m<D = 37º and m<F = 56º.  Find the measure of an exterior angle at E.
 
143º
93º
87º

 

 

5. Find the measure of <QRS using the information in the diagram to the right.
 
25º
84º
100º

 

 

6. What type of triangle has 3 congruent sides ?
 
isosceles
equilateral
scalene

        

 

 

7. Using Heron's formula, find the area of the triangle, to the nearest tenth.
 

        

9.7 square units
11.6 square units
12.4 square units

 

 

8. Find the :
 

        

25º
125º
155º