If one angle in a triangle measures $$60\text{°}$$ and another measures $$70\text{°}$$ , what is the measure of the third angle?

The third angle measures $$50\text{°}$$ (since $$180\text{°} - 60\text{°} - 70\text{°} = 50\text{°}$$ ).

What is the formula for the sum of angles in any polygon?

The sum of the interior angles of a polygon with $$n$$ sides is given by the formula $$(n-2) \times 180\text{°}$$ .

What is the definition of complementary angles?

Complementary angles are two angles whose measures add up to $$90\text{°}$$ .

What is the definition of supplementary angles?

Supplementary angles are two angles whose measures add up to $$180\text{°}$$ .

If two angles are complementary and one angle measures $$30\text{°}$$ , what is the measure of the other angle?

The other angle measures $$60\text{°}$$ (since $$90\text{°} - 30\text{°} = 60\text{°}$$ ).

What is the definition of an acute triangle?

An acute triangle is a triangle where all three angles are less than $$90\text{°}$$ .

What is the definition of an obtuse triangle?

An obtuse triangle is a triangle that has one angle measuring more than $$90\text{°}$$ .

If a triangle has angles measuring $$x\text{°}$$ , $$y\text{°}$$ , and $$z\text{°}$$ , what is the equation that relates them?

The equation is $$x + y + z = 180\text{°}$$ .

What is the relationship between the angles in a triangle and the sides opposite those angles?

In a triangle, the larger the angle, the longer the side opposite that angle.

Angles in a Triangle Flashcards

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15 questions

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1.

FLASHCARD QUESTION

Front

What is the sum of the interior angles in a triangle?

Back

2.

FLASHCARD QUESTION

Front

What is the measure of an exterior angle of a triangle?

Back

The measure of an exterior angle of a triangle is equal to the sum of the measures of the two opposite interior angles.

3.

FLASHCARD QUESTION

Front

Back

4.

FLASHCARD QUESTION

Front

What is the relationship between the angles in an isosceles triangle?

Back

In an isosceles triangle, the angles opposite the equal sides are equal.

5.

FLASHCARD QUESTION

Front

What is the definition of a right triangle?

Back

6.

FLASHCARD QUESTION

Front

How do you find the measure of an unknown angle in a triangle?

Back

7.

FLASHCARD QUESTION

Front

What is the measure of the angles in an equilateral triangle?

Back

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