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Angles
Lines
Classify Triangles by Angles
Classify Triangles by Sides
Vocabulary
100
What is an angle that is LESS than 90 degrees? Draw this angle.
An acute angle.
100
What are two lines that never meet, or cross each other. Draw the lines.
Parallel lines
100
Draw a right triangle. How many right angles does it have?
*See drawings* A right triangle has ONE right angle.
100
Draw a triangle. Label the sides XYZ.
*See drawings*
100
What is a straight path that goes on forever in TWO directions?
A line
200
What angle is EXACTLY 90 degrees? Draw this angle.
A right angle
200
What are two lines that meet (cross) at a right angle? Draw the lines.
Perpendicular lines
200
Draw an acute triangle. How many acute angles are there?
*See drawing* An acute triangle has THREE acute angles.
200
What do the tick marks on the sides of triangles mean?
The tick marks indicate that the sides of the triangle are EQUAL.
200
What is a part of a line that continues forever in one direction?
A ray
300
What angle is BIGGER than 90 degrees, but LESS than 180 degrees (a line). Draw this angle.
An obtuse angle.
300
What is the difference between a line and a line segment? Draw a picture with your answer.
A line is a straight path that goes on forever in BOTH directions. A line segment is a part of a line that has TWO endpoints.
300
Draw an obtuse triangle. How many obtuse angles are there?
*See drawing* An obtuse triangle has ONE obtuse angle.
300
What is the name of the triangle with THREE equal sides?
An equilateral triangle.
300
What is a figure formed by two rays or two line segments that meet at an endpoint?
An angle
400
I have an angle that is 120 degrees. What type of angle is this?
An obtuse angle. *Any angle larger than 90 degrees, but smaller than 180 degrees is obtuse.*
400
Draw a rectangle. How many lines of symmetry does the rectangle have?
The rectangle has 2 lines of symmetry.
400
How many right angles does a square have?
A square has FOUR right angles.
400
What is the name of the triangle with TWO equal sides?
An isosceles triangle.
400
What is a point at either end of a line segment, or at one end of a ray?
An endpoint
500
I have a 55 degree angle. What angle do I need in order to make a 100 degree angle?
A 45 degree angle. I already have a 55 degree angle, so I would add a 45 degree angle to make a 100 degree angle. 55 + 45 = 100
500
Draw a square. How many lines of symmetry does a square have?
A square has 4 lines of symmetry.
500
Draw a diamond. What TWO types of angles does a diamond have?
A diamond has both acute and right angles.
500
What is the name of the triangle with NO equal sides?
A scalene triangle.
500
What is a line that shows both sides are exactly the same if folded in half.
A line of symmetry