PLANE SHAPE2

WEEK 2

PLANE SHAPE

Pupils should be able to

(i) Identify parallel and perpendicular lines

 (a) label the diagrams below

appropriately

Triangle Properties

The properties of the triangle are:

The sum of all the angles of a triangle(of all types) is equal to 1800.

The sum of the length of the two sides of a triangle is greater than the length of the third side.

In the same way, the difference between the two sides of a triangle is less than the length of the third side.

The side opposite the greater angle is the longest side of all three sides of a triangle.

The exterior angle of a triangle is always equal to the sum of the interior opposite angles. This property of a triangle is called an exterior angle property

Two triangles are said to be similar if the corresponding angles of both triangles are congruent and the lengths of their sides are proportional.

Area of a triangle = ½ × Base × Height

The perimeter of a triangle = sum of all its three sides

(a) equilateral

-All sides are equal

-All angles are equal

(b) isosceles

-Two opposite sides are equal

-Two base angles are equal

(c) scalene

-The three sides are not equal

-The three angles are not equal

d). Right angled:

-Two sides are perpendicular

-One angle is a right angle

 (I). Parallelogram

-Opposite sides are equal

-Opposite sides are parallel