Section 1
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Altitude of a triangle is
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Last updated
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Date created
Mar 14, 2020
Cards (61)
Section 1
(50 cards)
Altitude of a triangle is
Perpendicular distance from a vertex to the site opposite of the vertex
Polygon is a
A closed figure whose lines are straight. Triangle as 3 sides, quaderlateral has 4, pentagon has 5, hexagon has 6, hexagon has 8.
Legs refers to
The two equal sides of an isosceles triangle OR the two shorter angles of a right triangle
Sum of interior angles of a octagon
Draw diagonals. Forms 6 triangles. 6*180 = 1080 degrees
Hypotenuse of a right triangle with two 45 degree angles (isosceles right triangle)
Area of a rectange
legth*width
Area of a triangle is
(1/2) base * height
Hypotenuse of a right triangle with angles 30 and 90
Perimeter of a rectange
2*(length + width
The sum of angles on one side of a line is
180 degrees, half a circle
The wider the angle of a triangle the longer the side...
opposite of it. If Angle B has the widest angle, the opposite side is the longest.
If angle C has the smallest angle, then the smallest side is
Opposite of angle C
Side opposite of a right triangle is called
Hypotenuse. Always longer than the other sides.
What is a vertex
Point at which two lines intersect to form an angle
Isosceles triangle
Triangle with two equal sides which are opposite of two equal angles
The 4 angles of a quadrilateral add up to
360
What is length of hypotenuse with legs = 6 and 8
Square root of 10. Triples 3,4,5 or any multiple of these numbers
The three exterior angles of a triangle add up to
360 degrees
What is the length of hypotenuse with legs = 3 and 4
Square root of 5. Triples 3,4,5
In a triangle, Side b = 2a, and c = b/2. What is the perimeter?
a + 2a + 2a/2 = 4a
If you have 5 angles around a single point, their sum is
360 degrees (a + b + c + d + e = 360 degrees)
Area of a right triangle ABC where AB = 5 and BC = 4
Cannot solve. AB could be hypotenuse, but AB and BC might also be legs.
AC = 9, BD = 11, and AD = 15. What is the length of CD?
Add/subtract lengths. CD = AD - AC
What is length of hypotentuse with legs = 12 and 16
12/3 = 4. So 4 * 5 = 20. Square root of 20.
If line A is perpindicular to line B (90 degrees), we write it as
Two most common pythagorean triples
3,4,5 and 5,12,13.
Area of a parallelogram
base * height
Radius
Half diameter
Exterior angle of a triangle is equal to
Sum of the interior REMOTE angles
In a right triangle, if you have two sides you can find the area. Why?
Because you have base and height.
A triangle has a base of 4, and a height of 2, what is the area
(1/2)42 (1/2)b*h
How to get sum of interior angles of polygon
Draw diagonals between a single vertex and all its nonadjacent angles. Count the number of triangles formed and multiply by 180 to get sum.
Sum of interior angles of pentagon
Draw diagonals, forms 3 triangles. 3*180 = 540 degrees
Two lines intersect to form angles A, B, C, D. How are these angles related
Opposite angles like A C are equal to eachother. Adjacent angles and AB are supplementary adding up to 180.
Pythagorean triples
Ratios that always satisfy the pythagorean theorem. Like 3,4,5 and any multiple of these numbers
Transversal angle relationships
Line BD bisects <ABC. The sum of ABD and DBC is...
<ABD
Acute angles are
Less than 90 degrees
<A of a triangle ABC is a right triangle. Is side BC longer or shorter than side AB
BC is longer
Abtuse angles are
Between 90 and 120 degrees
The third unequal side of an isosceles triangle is called
The base
Parallelogram
Quadrilateral with two parallel lines. Opposite sides and opposite angles are equal. Angles not opposite are supplementary
Equilateral triangle
All sides equal in length. All interior angles are 60 degrees
Supplementary angles add up to
180 degrees
A line that intersects two paralel lines is called
Transversal
If L1 | L2, and L2 | L3, then...
L1 | L3
Area of a square
side squared.
A polygon diagonal is
A line segment connecting any two nonadjacent polygons
The sum of angles around a single point is
360 degrees
A line segment that bisects an angle does what...
Splits the angle into two smaller equal angles
Section 2
(11 cards)