Unit 1 Day 1
Area of squares, rectangles, triangles, trapezoids, parallelograms, circles, and polygons
Area of squares, rectangles, triangles, trapezoids, parallelograms, circles, and polygons
(Scale Video 1 & 2)
(Tips From The Pros Video)
(Tips From The Pros Video)
Definitions:
Point:
a precise locations or place on a plane; usually represented with a dot
Line:
a geometrical abject that is straight, infinitely long, and thin
Plane:
a flat surface that is infinitely large with no thickness
Line Segment:
straight line in which links two points and doesn’t extend beyond them
Ray:
a portion of line that starts at a point and goes off in a particular direction
to infinity
Angle:
a shape formed by two lines or rays diverging from a common point
Median (of a triangle):
a line segment joining a vertex to the mid point of the opposite
Altitude:
the height of a shape
Perpendicular:
when two lines intersect at 90 degrees
Formulas
for Area:
Square-
base x height
Rectangle-
base x height
Triangle-
base x height
2
Trapezoid-
base1 + base2 x ½ height
Parallelograms-
base x height
Circle-
pi x radius squared
Polygon-
½ apothem x perimeter
Quiz:
1.) Find
the area of a circle with a diameter of 6.7”
2.)
Find the area of this trapezoid:
4’
10’
9’
3.)
Find the area of this polygon:
6”
 |
6” 6”
4”
6”
6”
6”
Answer Key:
1.)
7.6/2 = 3.35
3.35 squared= 11.2225
11.2225 x pi = 35.25” Squared
3.35 squared= 11.2225
11.2225 x pi = 35.25” Squared
2.)
10/2 = 5
4+9 = 13
5 x 13 = 65’
squared
3.)
4/2 = 2
6 x 6 = 36
36 x 2 = 72”
squared
Youtube Video:
Geometry Tips: How to Find Area of Geometric Shapes by eHow
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