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AB: optional BC: required

MB: optional ON: required

Teacher Resource 6.2 Unit 13 Measurement pp. P-28–33

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ME6-13

Area of Triangles and Parallelograms

Students will:

• develop the formula for the area of a triangle, using parallelograms, and then apply it.

AP Book 6.2 pp. 108–109

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• Either pair of parallel sides can be chosen as the bases.

• The height is the distance between the bases as measured along a line perpendicular to the bases.

Area = base × height

See p. P-28 for details.

Review area of a parallelogram.

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See p. P-29 for details.

Hint: If one side runs along a grid line, it's very convenient to use that side as the base.

Review:

Mark the base and height of this triangle.

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Exercises:

The height is given in the triangle. Name the base.

c)

d)

a)

b)

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Exercises:

Plot the points on a 10-by-10 grid. Join the points and identify the shape.

a) A (0, 1), B (0, 4), C (2, 4), D (2, 1)

y

x

Remind students how to plot points. See p. P-31 for details.

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c) I (3, 0), J (5, 4), K (8, 0)

b) E (0, 6), F (2, 10), G (5, 10), H (3, 6)

d) L (9, 0), M (9, 3), N (10, 2)

e) O (5, 8), P (9, 9), Q (9, 7), R (5, 6)

y

x