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congruent angles

Angles that contain the same number of degrees.

right angle

An angle that has a square corner because it is fromed by perpendicular lines. All right angles are 90*.

acute angles

Angles that are less than 90*.

obtuse angles

Angles that are more than 90 but less than 180.

straight angles

Angles that are 180*.


They have 3 angles. The sum of the angles of any triangle is 180*.
( A+ B+ C=180*)

right triangle

A triangle that has one right angle.

isosceles triangle

A triangle that has 2 congruent sides.

equilateral trianlge

A triangle that has 3 congruent sides.

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