Example 1. ABCD is a parallelogram, in which AB = 8 cm, AD = 6 cm and altitude AE = 4 cm. Find the altitude corresponding to side AD.
B
А
C
D
E
Area of parallelogram
Let altitube corresponding to be . Then ,
or or
Thus, altitube corresponding to AD is
Example 2. Find the area of the triangle whose sides are 13 cm, 14 cm and 15 cm.
14
13
Let
15
Area of triangle=
Literature:
Geometry for Elementery School
Geometry Strategies for Middle School
Mathematical Reasoning. D. Legault, Minnesota Literacy Council, 2014
Two-dimensional and three-dimenshional figures
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