Types of Triangles
An equilateral Triangle has ___ equal sides, ___ lines of symmetry, and each angle is ___°.
3 equal sides, 3 lines of symmetry, 60°
All of my angles are less than 90°. What kind of triangle am I? (Acute, Right, Obtuse)
Acute
Give 3 examples of a Polygon (3 different shapes)
Answers Vary
What are the four types of Polygons? (Not including Congruent)
Regular, Irregular, Concave, Convex
What is the formula for the Perimeter of ANY Polygon?
Perimeter = S + S + S + S...
An Isosceles Triangle has ___ equal sides, ___ lines of symmetry, and ___ equal angles.
2 equal sides, 1 line of symmetry, 2 equal angles
I have one angle that is 90°. What type of Triangle am I? (Acute, Right, Obtuse)
Right
What are the 3 rules that make up a polygon?
1) It must be a closed shape
2) All sides must be straight
3) Only 2 lines must meet at each vertex
Can a Regular Polygon be Concave?
No, a regular polygon must be convex.
What is the formula for the Perimeter of a Parallelogram?
Perimeter = 2xL + 2xS
OR
Perimeter = 2 x (L + S)
A Scalene triangle has ___ equal sides, ___ equal angles, and ___ lines of symmetry.
0 equal sides, 0 equal angles, 0 lines of symmetry.
I have 1 angle greater than 90°. What type of triangle am I? (Acute, Right, Obtuse)
Obtuse
Is a circle a Polygon? Explain your answer.
No- A circle does not have straight lines.
All of my angles are less than 180°, and all of my sides and angles are equal. What type of Polygon am I? (2 answers)
Regular - Convex
What is the formula for the perimeter of a regular polygon?
Perimeter = Side Length x Number of Sides
I am a triangle with side lengths 4cm, 3cm, and 4cm. My angles are 50°, 80°, and 50°. What type of triangle am I?
Isosceles
I have 2 angles greater than 90°. What type of triangle am I?
Not possible
What does each of the following prefixes mean?
Uni-
Tri-
Hexa-
1
3
6
All of my angles are less than 180°, but none of my sides and angles are equal. What type of polygon am I? (2 answers)
Irregular- Convex
I am a Polygon with 5 sides. My side lengths are 3cm, 2cm, 5cm, 6cm, and 4cm. What is my Perimeter?
Perimeter = S + S + S + S + S
Perimeter = 3 + 2 + 5 + 6 + 4
Perimeter = 20cm
I am a right triangle. Is it possible for me to be Scalene?
Yes
All Acute Triangles are also Scalene Triangles. True or False?
False - A Scalene Triangle has NO equal sides or angles. An Acute triangle could have equal angles.
What does each of the following prefixes mean?
Bi-
Quad-
Penta-
2
4
5
None of my sides or angles are equal, but one of my angles is greater than 180°. What type of polygon am I? (2 answers)
Irregular- Concave
I am a Parallelogram with side lengths 4cm and 5cm. What is my perimeter?
Perimeter = 2 x L + 2 x S
Perimeter = 2 x 4 + 2 x 5
Perimeter = 8 + 10
Perimeter = 18cm