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Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085

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Chapter
Section
BuyFindarrow_forward

Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085
Textbook Problem

When the bisectors of two consecutive angles of a

parallelogram meet at a point on the remaining side,

what type of triangle is:

a) ∆DEC? b) ∆ADE? c) ∆BCE?

To determine

a.

To find:

The type of the angle in ∆DECwhen the bisectors of two consecutive angles of the parallelogram ABCD meet at a point on the remaining side.

Explanation

Given:

The bisectors of two consecutive angles of the parallelogram ABCD are shown below.

Corollary:

A parallelogram is a quadrilateral in which both pairs of opposite sides are parallel.

In the given parallelogram ABCD.

PROOF
Statements Reasons
1. Parallelogram ABCD 1. Given
2. AD¯BC¯ 2. By the definition of a parallelogram
3. EDC=D2 and
DCE=C2
3. Since DE and CE are angle bisectors of D and C
4
To determine

b.

To find:

The type of the angle in ∆ADEwhen the bisectors of two consecutive angles of the parallelogram ABCD meet at a point on the remaining side.

To determine

c.

To find:

The type of the angle in ∆BCEwhen the bisectors of two consecutive angles of the parallelogram ABCD meet at a point on the remaining side.

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