How to find an angle in an acute / obtuse triangle

Practice Questions

High School Math › How to find an angle in an acute / obtuse triangle

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1

The base angle of an isosceles triangle is 15 less than three times the vertex angle. What is the vertex angle?

2

Exterior_angle

If the measure of $\angle A=52^{\circ}$ and the measure of $\angle B= 43^{\circ}$ then what is the meausre of $\angle\theta$ ?

3

Which of the following can NOT be the angles of a triangle?

4

In a given triangle, the angles are in a ratio of 1:3:5. What size is the middle angle?

5

Exterior_angle

If the measure of $\angle A=56^{\circ}$ and the measure of $\angle B=47^{\circ}$ then what is the meausre of $\angle\theta$ ?

6

In $\Delta ABC$ , , , and . To the nearest tenth, what is $m \angle A$ ?

7

In the triangle below, AB=BC (figure is not to scale) . If angle A is 41°, what is the measure of angle B?

A (Angle A = 41°)

Act_math_108_02

B C

8

Rt_triangle_letters If angle $a=38^\circ$ and angle $c=82^\circ$ , what is the value of ?

9

The base angle of an isosceles triangle is five more than twice the vertex angle. What is the base angle?

10

You are given a triangle with angles degrees and degrees. What is the measure of the third angle?

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