FEATURES OF TRIANGLES

How many sides have a triangle?

3

What is formulae for finding the area of a triangle?

A=1/2bh

How many sides have a rectangle?

4

What is formulae for finding the area of a triangle?

A=lb

A B

CD F

E

What is the area of rectangle ABCD?

A =AB*AD

What is the area of triangle ABF?

A =1/2 AB*FE

What is relation between FE and AD?

AD=FE

What is the relation between area of triangle ABF and area of rectangle ABCD?

Area of ABCD=1/2 Area of ABF

Area of the rectangle is double, the area of triangle obtained by the two vertices on the side of rectangle and third vertex is on the opposite side.

A B

CD

F

P

What is the area of rectangle ABCD?

A=AB*AD

What is the area of triangle ABF?

A=1/2 AB*PF

What is the relation between AD and PF?

AD = PF

What is the relation between area of triangle ABF and area of rectangle ABCD?

Area of ABCD=1/2Area of ABF

Area of a rectangle is double, the area of a triangle obtained by the two vertices on side of the rectangle and third vertex is on the extended opposite side.

A BC D F G

Q R SP

What is the area of triangle ABP?

A=1/2 AB*PC

What is the area of triangle ABQ?

A=1/2 AB*QD

What is the area of triangle ABR?

A=1/2 AB*RF

What is the area of triangle ABS?

A=1/2 AB*SG

What is the relation between PC,QD,RF and SG?

These sides are equal.

What is the relation between area of triangle ABP,ABQ,ABR,and ABS?

These are equal.

Triangles with the same base and between the same

parallels are of equal area

Can you draw a triangle with same area as the triangle ABC shown below but with the angle at A, a right angle?

A

C

B

The area of the triangle between same parallel lines and have same base are ----------

Find the vertices of the triangle that have half of the area of a rectangle?

The distance between parallel line are ------- every time

AB=5cm, BC=7cm, angle ABC=60. Draw the triangle ABC. Draw another triangle with same area.

AB= 4cm, BC= 5cm, CA= 6cm. Draw the triangle ABC. Draw an isosceles triangle with same area as ABC.