11.2 Triangles and Parallelograms

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11.2 Triangles and Parallelograms
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T100 The area of a parallelogram is equal to the
product of the base and the height. A bh
h
b
A
Find the area of MATH
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Why is the Area bh?
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A
You will receive one point for each line, plus
the correct unit. Minimum 3 lines.
A bh 13(6) 78cm2
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T101 The area of a triangle is equal to one-half
the product of a base and the height (or
altitude) for that base.
A bh Where b is the length of the base and
h is the altitude. Altitude may be inside,
outside or the leg of the triangle. The base may
not always be at the bottom.
h
b
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Find the area of this triangle.
12mm
8mm
Find the base of a triangle with an altitude of
15 and area 60.
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Find the base of a triangle with an altitude of
15 and area 60.
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Find the area of a parallelogram whose sides are
14 and 6 and whose acute angle is 60. Draw and
label.
D
U
C
K
How will you find the height?
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D
U
C
K
S
Drop line DS to form a 30-60-90 triangle. Line DS
is
A bh 14( ) 42
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The diagonals of a kite are 10 and 24. Find the
kites area.
Draw the shape, label. What shapes do you have
to use? Write the formula needed and solve.
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Assignment Make your own area problem! Come up
with creative picture (ex fish, bird, house)
that involves at least 4 different shapes
(circles, rectangles, parallelograms, triangles).
Write a rough draft and then a final draft on
the construction paper. Leave room on your final
draft for someone to solve your problem. You have
15 minutes to come up with the problem When
finished Pass your problem to the person behind
you to calculate the area!
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Get the homework done so you dont have any over
the break! Pg 519 2-20 Evens