Angles
Inscribed angle
Angle = Arc/2
Area of a rectangle
Area = length x width
Parallel lines
Lines that never touch
If a triangle has an interior angle of 40 and 80, what is the third angle?
60o
What does SSS determine?
All three sides of two different triangles are congruent.
Exterior Angle
Angle = (big-small)/2
Area of a triangle
Area = base(height)/2
Perpendicular lines
Two lines that intersect to form a 90o angle
In what type of triangle are all three sides the same length?
Equilateral
What does SAS determine?
Two pairs of sides and the angle between them are congruent in two different triangles.
Interior Angle
Angle = (Arc1 + Arc2)/2
Area of a circle
Area = πr2
Acute angle
An angle with a measure of less than 90o
In an equilateral triangle, what is the measurement of each individual angle?
60o
What does ASA determine?
Two pairs of angles and the side between them are congruent.
Arc Length
length/2πr = angle/360
Area of a trapezoid
Area = height(base1 + base2)/2
Obtuse angle
An angle with a measure of more than 90o
What type of triangle has two equal sides and a unique side?
Isosceles triangle
What does AAS determine?
Two corresponding angles and one non-included side are equal.
Area Sector
Sector/πr2 = Angle/360
Midpoint
(x1 + x2)/2, (y1 + y2)/2
Supplementary angles
Two perpendicular angles that add up to 180o
What type of triangle has three different angle measures?
Scalene triangle
What dos HL determine?
The hypotenuse leg of one right triangle is congruent to that of another right triangle.