Finding Areas of Parallelograms and Triangles
Learn how to find the area of parallelograms and triangles using base and height measurements. Explore examples and coordinate plane calculations to enhance your understanding. Apply the theorem for calculating the area of triangles with ease. Complete homework exercises to reinforce your learning.
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Presentation Transcript
7-1 Areas of Parallelograms and Triangles M11.C.1 2.9.11.G Objectives: 1) To find the area of a parallelogram and a triangle.
Area of a Rectangle the area of a rectangle is the product of its base and height. Area of a Parallelogram the area of a parallelogram is the product of a base and the corresponding height. A = bh A = bh
A base of a parallelogram is any of its sides. The corresponding altitude is a segment perpendicular to the line containing that base drawn from the side opposite the base. The height is the length of an altitude.
Examples Find the area of each parallelogram.
EXAMPLE: FINDING AREA IN THE COORDINATE PLANE Find the area of Parallelogram ABCD With vertices A (-4, 3), B(-2,-1), C(3,-1), D(1,3)
Example For parallelogram ABCD, find CF to the nearest tenth.
Example Find h.
Theorem: Area of a Triangle The area of a triangle is half the product of a base and the corresponding height. A = 1/2bh
Example Find the area of triangle ABC. Find the area of triangle ABD.
Homework Handed In Page 351 #1-3, 11-13, 15-21
