Unit 1 Day 1

Unit one day one :  Area of square,rectangle, triangle, trapezoids, parallelogram, circles, and polygons. Define point, line, plane, line segment, ray, angle, median, altitude, perpendicular.


Area of a square

Square Area = a2 a = length of side

Area of rectangle

Rectangle Area = w × h w = width h = height

Area of triangle

Triangle Area = ½ × b × h b = base h = vertical height

Area of trapizoids

Trapezoid (US) Trapezium (UK) Area = ½(a+b) × h h = vertical height

Area of parllelogram

Parallelogram Area = b × h b = base h = vertical height

Area of circles

Circle Area = π × r2 Circumference = 2 × π × r r = radius

Area of polygons
The area of any polygon is given by:

or

where,
S  is the length of any side
N  is the number of sides
π  is PI, approximately 3.142

Define:
line The notion of line or straight line was introduced by ancient mathematicians to represent straight objects.

plane In mathematics, a plane is a flat, two-dimensional surface.
 
line segment In geometry, a line segment is a part of a line that is bounded by two distinct end points.

ray A portion of a line which starts at a point and goes off in a particular direction to infinity.

angle In geometry, an angle is the figure formed by two rays.

median  a point, line, part, or plane that is in the middle.

altitude An altitude is the perpendicular segment from a vertex to its opposite side.

perpendicular it is when a line are the same all the way down and dont cross.

http://www.youtube.com/watch?v=ECJfSyg_Obo

Quiz
1:if a square is 10x10
2 if a rectangle is 10x15
3 if a rectangle 30x60
answers
1:100
2:150
3:1800