Math Flashcards
(25 cards)
What is the sum of the interior angles of a triangle?
180 degrees.
True or False: An equilateral triangle has all sides of equal length.
True.
Fill in the blank: A triangle with one angle measuring more than 90 degrees is called a _____ triangle.
obtuse.
What type of triangle has two sides of equal length?
Isosceles triangle.
Multiple choice: What is the name of a triangle with three sides of different lengths? (A) Equilateral (B) Isosceles (C) Scalene
C) Scalene.
What is the formula for calculating the area of a triangle?
Area = 1/2 * base * height.
True or False: A right triangle has one angle that measures exactly 90 degrees.
True.
What is the longest side of a right triangle called?
Hypotenuse.
Fill in the blank: The Pythagorean theorem states that in a right triangle, the square of the hypotenuse is equal to the sum of the squares of the _____ and _____ sides.
other, two.
Multiple choice: Which triangle type is defined by having all angles less than 90 degrees? (A) Acute (B) Right (C) Obtuse
A) Acute.
What is an exterior angle of a triangle?
An angle formed by one side of the triangle and the extension of an adjacent side.
True or False: The exterior angle of a triangle is equal to the sum of the two opposite interior angles.
True.
What is the name of the point where the three medians of a triangle intersect?
Centroid.
Multiple choice: Which point is the intersection of the angle bisectors of a triangle? (A) Circumcenter (B) Incenter (C) Orthocenter
B) Incenter.
Fill in the blank: The _____ is the point where the three altitudes of a triangle intersect.
Orthocenter.
What is the term for a triangle that has one angle equal to 90 degrees?
Right triangle.
True or False: All equilateral triangles are also isosceles.
True.
What is the relationship between the sides of a 30-60-90 triangle?
The side opposite the 30° angle is half the hypotenuse, and the side opposite the 60° angle is √3/2 times the hypotenuse.
Multiple choice: What is the circumcenter of a triangle? (A) Center of the circumcircle (B) Center of the incircle (C) Intersection of medians
A) Center of the circumcircle.
What is the formula for the perimeter of a triangle?
Perimeter = side1 + side2 + side3.
Fill in the blank: The _____ of a triangle is the line segment that connects a vertex to the midpoint of the opposite side.
median.
True or False: The angles opposite equal sides in an isosceles triangle are also equal.
True.
What is the name of the triangle formed by connecting the midpoints of the sides of another triangle?
Median triangle.
Multiple choice: How many lines of symmetry does an equilateral triangle have? (A) 1 (B) 2 (C) 3
C) 3.
