Which biconditional statement is true? a shape is a rectangle if and only if the shape has exactly four sides and four right angles. a shape is a trapezoid if and only if the shape has a pair of parallel sides. a shape is a triangle if and only if the shape has three sides and three acute angles. a shape is a square if and only if the shape has exactly four congruent sides.

The first one: A shape is a rectangle if and only if the shape has exactly four sides and four right angles.

Step-by-step explanation:

The true statement is the first one:

A shape is a rectangle if and only if the shape has exactly four sides and four right angles.

A shape is a rectangle if and only if the shape has exactly four sides and four right angles.

Step-by-step explanation:

From the given options only option one is correct because it is true from both ways.

It can be written as If a shape has exactly four sides and four right angles then the shape is a rectangle.

It is not true because a if the shape has a pair of parallel sides then it can be a parallelogram.

 It is not true because a if the shape has three sides and three acute angles then it is only a acute triangle.

 It is not true because if the shape has exactly four congruent sides then it can also be rhombus.

So the only true bi-conditional statement is "A shape is a rectangle if and only if the shape has exactly four sides and four right angles. "

3: 2

step-by-step explanation:

shorter piece is 2: 3, so just reverse it, and you get 3: 2

step-by-step explanation:

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