Intermediate Geometry : Quadrilaterals

Study concepts, example questions & explanations for Intermediate Geometry

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Example Questions

Example Question #431 : Intermediate Geometry

A parallelogram has adjacent sides with the lengths of \(\displaystyle 4\) and \(\displaystyle 13\). Find a pair of possible adjacent side lengths for a similar parallelogram. 

Possible Answers:

\(\displaystyle 1\) and \(\displaystyle 4\)

\(\displaystyle 12\) and \(\displaystyle 26\)

\(\displaystyle 12\) and \(\displaystyle 39\)

\(\displaystyle 1\) and \(\displaystyle 3\)

Correct answer:

\(\displaystyle 12\) and \(\displaystyle 39\)

Explanation:

Since the two parallelogram are similar, each of the corresponding sides must have the same ratio. 

The ratio of the first parallelogram is:

\(\displaystyle 4:13\)

Applying this ratio we are able to find the lengths of a similar parallelogram.

\(\displaystyle 4:13=(4\times 3):(13\times3 )=12:39\)

Example Question #1 : How To Find If Parallelograms Are Similar

A parallelogram has adjacent sides with the lengths of \(\displaystyle 15\) and \(\displaystyle 5\). Find a pair of possible adjacent side lengths for a similar parallelogram. 

Possible Answers:

\(\displaystyle 1:4\)

\(\displaystyle 4:1\)

\(\displaystyle 1:3\)

\(\displaystyle 3:1\)

Correct answer:

\(\displaystyle 3:1\)

Explanation:

Since the two parallelogram are similar, each of the corresponding sides must have the same ratio. 

The ratio of the first parallelogram is:

\(\displaystyle 15:5\rightarrow 3:1\)

Applying this ratio we are able to find the lengths of the second parallelogram.

\(\displaystyle 15:5=(15\div 5):(5\div 5)=3:1\)

Example Question #1 : How To Find If Parallelograms Are Similar

A parallelogram has adjacent sides with the lengths of \(\displaystyle 28\) and \(\displaystyle 8\). Find a pair of possible adjacent side lengths for a similar parallelogram. 

Possible Answers:

\(\displaystyle 4:1\)

\(\displaystyle 2:9\)

\(\displaystyle 7:2\)

\(\displaystyle 16:4\)

Correct answer:

\(\displaystyle 7:2\)

Explanation:

Since the two parallelogram are similar, each of the corresponding sides must have the same ratio. 

The ratio of the first parallelogram is:

\(\displaystyle 28:8 \rightarrow 28\div4:8\div4 \rightarrow 7:2\)

Thus by simplifying the ratio we can see the lengths of the similar triangle.

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