HW due on 03/27/2015

Here is the next week's  Home Work

What am I

1.     I can be called a rectangle, a quadrilateral, a rhombus, and a parallelogram. All of my sides are equal and I have four right angles. What am I?

2.     I am a quadrilateral. Two of my sides are parallel and two are not. What am I?

3.     I am a quadrilateral with two pairs of parallel sides. My opposite sides are equal in length and my opposite angles are equal. What am I?

4.     I am a 4 sided figure with no parallel sides. What am I?

5.     I am both a quadrilateral and a parallelogram. All four of my sides are the same length. My opposite angles are equal. What am I?

PERIMETER

   1. Find the perimeter of the triangle with the sides of 8 cm, 5 cm and 9 cm long. 

   2. Find the perimeter of the triangle, if the first side is of 8 cm long, the second side is in 4 cm     longer, and the third side measure is half of the sum of that of the first and the second sides. 

   3.Find the missed side of the triangle, if the first side is 7 cm long, the second side is 2 cm shorter and the perimeter of the triangle is 16 cm. 

   4.In a triangle, the second side is in 7 cm longer than the first one and the third side is in 4 cm shorter than the second one. Find the measures of the triangle sides, if the perimeter of the triangle is 40 cm. 

   5.Find the measures of the triangle sides, if the second side is in 6 cm shorter than the first one, the third side measure is half of the sum of the measures of the first and the second sides, and the perimeter of the triangle is 30 cm.

PERIMETER

PERIMETER

The perimeter of a polygon is equal to the sum of the length of its sides.

PERIMETER OF A TRIANGLE

Equilateral Triangle

Isosceles Triangle

Scalene Triangle

Square

Rectangle

Rhombus

Rhomboid

P = 2 · (a + b)

Regular Polygon

Circle

Polygons

POLYGON

A polygon is a closed shape with three or more straight sides and angles.

CHARACTERISTICS OF A POLYGON

• Closed figure
• Has at least three sides
• At least three angles
• No curved lines
• No intersecting lines

TYPES OF POLYGONS

Convex Polygon

All of its angles are less than 180°.

All of the diagonals are internal.

Concave Polygon

At least one angle measures more than 180 degree

At least one of the diagonals is outside the shape of the polygon.

Equilateral Polygon

All sides are equal.

Equiangular Polygons

All angles are equal.

Regular Polygon

They have equal angles and sides

Irregular Polygon 

They do not have equal angles and sides.

Types of Polygons based on Number of Sides

# of Sides	Name
3	Triangle
4	Quadrilateral
5	Pentagon
6	Hexagon
7	Heptagon
8	Octagon
9	Nonagon
10	Decagon