Base and the Height of a Triangle
Suprise!
Area of a Triangle
Area of Parallelograms
Vocab
100
True or False?
The height of a triangle MUST be one of its sides.
FALSE! The height can be in the middle or outside of the triangle. The BASE must be one of the sides of the triangle.
100
A rectangle is made up of how many triangles?
2
100
What is the formula for the area of a triangle?
(b xx h)/2
100
What is the formula for the area of a parallelogram?
b xx h
100
What does it mean when two lines are parallel?
Those two lines are going the same direction and will never cross.
200
Are the base and the height labeled correctly? If not, what's wrong?
The height does not extend all the way to the vertex.
200
Mr. Lena says the area of a triangle is 5u. Ms. Adams says she agrees, but he's missing something. What is it?
The units squared! It should be 5u2.
200
What is the area of this Triangle?
24ft2
200
Find the area.
15u2
200
What is a vertex?
A place where two lines intersect.
300
If my HEIGHT is 6in, what is my base?
3in.
300
What are the three requirements for a parallelogram?
1. 4 sides (quadrilateral)
2. Opposite sides are parallel
3. Opposite sides are equal length
300
Find the area
8u2
300
Find the area
15u2
300
When two things are perpendicular, what degree angle do they form?
900 Angle. 
400
1. base=e, height=f
2. base=f, height=e
3. base=d, height=g
400
When is Mr. Lena's birthday?
Today!!!!
400
Find the area. 
A=6u2
400
A parallelogram has a base of 3.5 units and a corresponding height of 2 units. What is its area?
7u2
400
Show me with your arms, what is the formula for the area of a triangle!!
That was beast.
500
What are the three steps, in order, when finding the area of a triangle?
1. Choose a base
2. Find the opposite Vertex
3. Draw a height that is perpendicular to the base and reaches the opposite vertex.
500
3.05 x 8.1
24.705
500
Find the area.
25u2
500
If the area of this parallelogram is 10u2, what is its height?
2u.
500
Parallel is to perpendicular as black is to ______.
White