Angles and Triangles

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right angle

an angle that is exactly 90 degrees.

obtuse angle

an angle that is greater than 90 degrees and less than 180 degrees.

straight angle

an angle that measures exactly 180 degrees.

acute angle

angles that are greater than 0 degrees and less than 90 degrees

complementary angles

two Angles that add up to 90 degrees.

supplementary angles

two angles that add up to 180 degrees.

vertex

A point where two or more rays meet. (A corner)

Acute Triangle

A triangle where each angle is less than 90.

Isosceles Triangle

A triangle with 2 sides the same length and 2 equal angles.

Scalene Triangle

A triangle with 3 different side lengths

Equilateral Triangle

A triangle with 3 equal sides

right scalene

A triangle with a right angle AND a no sides are congruent/equal

right isosceles

A triangle with a right angle AND two sides are congruent/equal

acute scalene

A triangle with all acute angles AND no sides are congruent/equal

acute isosceles

A triangle with all acute angles AND two sides are congruent/equal

obtuse scalene

A triangle with an obtuse angle AND no sides are congruent/equal.

obtuse isosceles

A triangle with an obtuse angle AND two sides are congruent/equal

Obtuse Triangle

A triangle with one angle greater than 90

Right Triangle

A triangle with one right angle.

vertical angles

Angles opposite each other that are equal

adjacent angles

Angles that share a common ray(side).

acute equilateral

Classify the triangle

acute isosceles

Classify the triangle

acute scalene

Classify the triangle

obtuse isosceles

Classify the triangle

obtuse scalene

Classify the triangle

30 degrees

Find the missing angle measure

122 degrees

Find the value of ?

26 degrees

Find the value of ?

75 degrees

Find the value of ?

77 degrees

Find the value of ?

70 degrees

Find the value of a pair of supplementary angles if one angle measures 110 degrees

75 degrees

Find the value of x

x=14 degrees

Find the value of x

Perpendicular Lines

Lines that intersect to form right angles.

parallel lines

Lines that never intersect(meet).

1 degree

The measure of an angle is 179°. What is the measure of a supplementary angle?

63 degrees

The measure of an angle is 27°. What is the measure of a complementary angle?

136 degrees

The measure of an angle is 44°. What is the measure of a supplementary angle?

16 degrees

The measure of an angle is 74 °. What is the measure of a complementary angle?


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