14) Use the Pythagorean theorem to find the measure of side x. 20 cm 15 cm 35

Elementary Geometry For College Students, 7e
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Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
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**Problem 14: Use the Pythagorean theorem to find the measure of side \( x \).**

A right triangle is shown with one side measuring 20 cm, another side measuring 15 cm, and the hypotenuse labeled \( x \).

**Answer Choices:**
- A) 35
- B) 25
- C) 625
- D) 45

### Explanation

In a right triangle, the Pythagorean theorem is expressed as:

\[ a^2 + b^2 = c^2 \]

Where \( a \) and \( b \) are the lengths of the legs, and \( c \) is the length of the hypotenuse. Here, the lengths of the legs are 15 cm and 20 cm, and \( x \) is the hypotenuse.

Substitute the given lengths into the equation:

\[ 15^2 + 20^2 = x^2 \]

Calculate:

\[ 225 + 400 = x^2 \]

\[ 625 = x^2 \]

Taking the square root of both sides gives:

\[ x = 25 \]

Therefore, the correct answer is **B) 25**.
Transcribed Image Text:**Problem 14: Use the Pythagorean theorem to find the measure of side \( x \).** A right triangle is shown with one side measuring 20 cm, another side measuring 15 cm, and the hypotenuse labeled \( x \). **Answer Choices:** - A) 35 - B) 25 - C) 625 - D) 45 ### Explanation In a right triangle, the Pythagorean theorem is expressed as: \[ a^2 + b^2 = c^2 \] Where \( a \) and \( b \) are the lengths of the legs, and \( c \) is the length of the hypotenuse. Here, the lengths of the legs are 15 cm and 20 cm, and \( x \) is the hypotenuse. Substitute the given lengths into the equation: \[ 15^2 + 20^2 = x^2 \] Calculate: \[ 225 + 400 = x^2 \] \[ 625 = x^2 \] Taking the square root of both sides gives: \[ x = 25 \] Therefore, the correct answer is **B) 25**.
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