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The World Of Triangles
Triangles
• A triangle is a 3-sided polygon. Every triangle has three sides and three angles, which when added together equal 180°.
Acute Triangles
• A triangle in which all three angles are less than 90°.
Obtuse Triangles
• An obtuse triangle is a triangle in which one of the angles is greater than 90°.
Right Triangles
• A right triangle is triangle with an angle of 90°.
Scalene Triangles
• A triangle with three unequal sides.
Isosceles Triangles
• An isosceles triangle is a triangle with (at least) two equal sides.
Isosceles Triangle Theorem
• The following movie shows that if two sides of a triangle are congruent, then the angles opposite those sides are congruent.
Equilateral Triangles
• An equilateral triangle is a triangle with all three sides of equal length.
Equiangular Triangles
• An equiangular triangle is a triangle which has three equal angles.
Congruent Triangles
• Congruent triangles are triangles whose corresponding angles and sides are congruent.
• They are exactly the same size and shape.
The Hypotenuse
• The hypotenuse of a right triangle is the triangle's longest side, i.e., the side opposite the right angle.
The Pythagorean Theorem
• For a right triangle with legs a and b and hypotenuse c, a2+b2=c2.
Triangle Quiz
• Please complete the following quiz that covers the information that was just presented to you.
Question 1
• If a triangle has three unequal sides it is a ______ triangle.– A) Scalene– B) Obtuse– C) Isosceles
• Answer:– A) Scalene
Question 2
• A triangle which has three equal angles is a ______ triangle.– A) Acute– B) Equilateral– C) Equiangular
• Answer:– C) Equiangular
Question 3
• A triangle with (at least) two equal sides is a ______ triangle.– A) Scalene– B) Isosceles– C) Congruent
• Answer:– B) Isosceles
Question 4
• Two triangles that are equal are called ______ triangles– A) Acute – B) Obtuse – C) Congruent
• Answer:– C) Congruent
Question 5
• A triangle with all three sides of equal length is a ______ triangle.– A) Equilateral– B) Right– C) Equiangular
• Answer:– A) Equilateral
Question 6
• A triangle with an angle of 90° is a ______ triangle.– A) Acute– B) Right– C) Congruent
• Answer:– B) Right
Question 7
• A triangle in which all three angles are less than 90° is a ______ triangle.– A) Right– B) Acute– C) Scalene
• Answer:– B) Acute
Question 8
• A triangle in which one of the angles is greater than 90° is a ______ triangle.– A) Obtuse– B) Isosceles– C) Acute
• Answer:– A) Obtuse
Question 9
• What is the Hypotenuse of a right triangle?– A) The smallest angle.– B) The side opposite the
right angle.– C) The right angle.
• Answer:– B) The side opposite the
right angle.
Question 10
• The Pythagorean Theorem states …– A) r2
– B) (a+b)2/2=c– C) a2+b2=c2
• Answer:– C) a2+b2=c2
Question 11
• Use the Pythagorean Theorem to solve the following:– a = 5– b = 12– c = ?
• Answer:– c = 13