Thread: Help with trapezoid proof please!

Given: LORI is a rectangle; seg LB cong seg DO
Prove: BIRD is an isosceles trapezoid
__________________________________________________ _________________
Statements *Reasons

LORI is a rectangle; seg LB cong seg DO
*Given
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Originally Posted by pleasepleasehelp

Given: LORI is a rectangle; seg LB cong seg DO
Prove: BIRD is an isosceles trapezoid
__________________________________________________ _________________
Statements *Reasons

LORI is a rectangle
*Given
__________________________________________________ _________________

Hello again, pleasepleasehelp,

Here we go....


GIVEN

LORI is a rectangle.
GIVEN

and are right angles.
A RECTANGLE HAS 4 RIGHT ANGLES.

are right triangles.
DEFINITION OF RIGHT TRIANGLE


OPPOSITE SIDES OF A RECTANGLE ARE CONGRUENT


LL Theorem


CPCTC

BIRD is a trapezoid.
DEFINITION OF ISOSCELES TRAPEZOID

What is the LL theorem? oh and I think you mean triangle BLI not BLO

Originally Posted by pleasepleasehelp

What is the LL theorem?

LL Theorem: Congruency theorem for right triangles only.

If the legs of one right triangle are congruent to the
corresponding legs of another right triangle,
then the triangles are congruent.

This theorem is proved using the SAS postulate.

Thanks, yet again you've managed to help me understand

Originally Posted by pleasepleasehelp

What is the LL theorem? oh and I think you mean triangle BLI not BLO

You're right. Typo! I fixed it. Thanks.