Show:
Classifying by Sides
Triangle Art
Classifying by Angles
Miscellaneous
Triangles Defined
100
I have 3 equal sides.
What is an equilateral triangle?
100
Draw an acute triangle.
What is "Show your art."
100
A triangle with all angles < 90 degrees.
What is an acute triangle?
100
This is the measurement of every angle in an equilateral triangle.
What is 60 degrees?
100

The sum of two angles is 180 degrees.

What is supplementary angles?

200
A triangle with at least 2 equal sides.
What is an isosceles triangle?
200
Draw an obtuse triangle.
What is "Show teacher."
200
A triangle with one angle > 90 degrees.
What is an obtuse triangle?
200
Josh drew an acute isosceles triangle. He had an angle that measured 90 degrees and 2 sides that were equal. What was wrong with his drawing?
What is he had a right angle in a triangle that needs 3 angles that are each < 90 degrees.
200

The sum of two angles is 90 degrees.

What is complementary angles?

300
A triangle with no equal sides.
What is a scalene triangle?
300
Draw an equiangular triangle.
What is "Show teacher triangle with all angles equal."
300
A triangle with one angle measuring exactly 90 degrees.
What is a right triangle?
300
This triangle has 2 sides the same length and one right angle. Classify by both angles and sides.
What is a right isosceles triangle?
300

How many angles make up a triangle? What is the sum of the angles measurements?

What is 3 and 180 degrees?

400
A triangle is equilateral, so this is also true about that triangle: A) It is a right triangle. B) It is a scalene triangle. C) The triangle is equiangular. D) The triangle is obtuse.
What is the triangle is equiangular?
400
Draw a triangle with perpendicular lines.
What is a right triangle drawing?
400
A triangle with the following angle measurements: 97 degrees, 40 degrees, and 43 degrees.
What is an obtuse triangle?
400
This triangle is an acute obtuse triangle. Is this possible? Why or why not?
What is not possible, because an obtuse triangle has one angle >90 degrees and an acute triangle has all 3 angles < 90 degrees.
400
Triangle Inequality Theorem

What is the sum of two sides must be greater than the measurement of the third side to be a triangle?

500
The sides of an isosceles triangle could measure the following: A) 6", 7", 8" B) 9", 9", 9" C) 6", 9", 11" D) 6", 6.5", 7"
What is B, 9", 9", 9"?
500
Draw a triangle that is obtuse and scalene.
What is a triangle with an obtuse angle and no equal sides.
500
This triangle has one angle measuring 88 degrees.
What is an acute triangle?
500
An equilateral triangle can be an isosceles triangle. True or false, and why?
What is true, because an equilateral triangle has 3 equal sides. An isosceles triangle has ATLEAST 2 equal sides, which means it could also have 3 equal sides.
500

Pairs of opposite angles made by two intersecting lines

What is vertical angles?