Tuesday, April 5, 2016
Thursday, March 24, 2016
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
|
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