Classifying Triangles
Finding angles
Triangle Inequality Theorem
100
What is the name of a triangle that has NO equal side lengths?
What is is scalene
100
What is the SUM of angles in any triangle?
What is 180°
100
Will these side lengths form a triangle? Justify your answer.
5in, 2in, 1in
No :( because 2 + 1 < 5
200
What is the name of a triangle that has ALL equal sides?
What is equilateral
200
What is the theorem for finding the SUM of angles in any polygon?
(Write out the theorem)
What is (n-2)180
200
Determine if the given lengths will form a triangle. Justify your answer.
8 in, 10 in, 5 in
Yes! Because 8 + 10 > 5, 5 + 10 > 8, and 5 + 8 > 10
300
What is the name of a triangle that has TWO equal sides, and therefore TWO equal angles?
What is isosceles
300
Solve for the SUM of angles in a dodecagon (12 sides).
What is 1,800°
300
Determine if the given lengths will form a triangle. Justify your answer.
11 cm, 17 cm, 6 cm.
No :( because 11 + 6 = 17
400
What is it called when the angles in a triangle are ALL LESS THAN 90°?
What is an acute triangle
400
Solve for the value of EACH angle of a 44-gon.
What is 171.82°
400
Find the range of possible values for third side of the triangle with sides
10ft and 5ft. Remember to write it in the correct format.
What is 5 < x < 15
500
What is called when ONE of the angles in a triangle is GREATER THAN 90° ?
What is an obtuse triangle.
500
Find the missing angle measurement in this polygon.
What is x = 110°
500
Consider the triangle with 10ft and 5ft as two sides. What is a possible length for the third side? Justify that the three lengths will form a triangle.
Range: 5 < x < 15
Possible length = 6
Justify: 10 + 6 > 5, 6 + 5 > 10, 5 + 10 > 6