Practice with Triangles
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Answer the following questions regarding triangles:

1. In triangle ABC, m<A = 48°, and m<C = 24°.   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.
 
100°
60°
20°

 

 

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

 

 

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

 

 

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

 

 

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 :
 

        

25°
125°
155°